<?xml version="1.0" encoding="us-ascii"?>
<!-- DFS ActiveDisclosure(SM) XBRL Schema Document - http://www.dfsco.com/financial-services/ -->
<!-- Creation Date      : 2018-02-26T15:00:08.3489640+00:00 -->
<!-- Version            : 2.9.6605.1333 -->
<!-- Package ID         : 80864e97734c4e118be5ec101b37c255 -->
<!-- Copyright (c) 2018 Donnelley Financial, LLC. All Rights Reserved. -->
<schema xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:us-types="http://fasb.org/us-types/2017-01-31" xmlns:stpr="http://xbrl.sec.gov/stpr/2011-01-31" xmlns:naics="http://xbrl.sec.gov/naics/2017-01-31" xmlns:spsc="http://www.spscommerce.com/20171231" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:us-gaap="http://fasb.org/us-gaap/2017-01-31" xmlns:dei="http://xbrl.sec.gov/dei/2014-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:country="http://xbrl.sec.gov/country/2017-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:currency="http://xbrl.sec.gov/currency/2017-01-31" xmlns:exch="http://xbrl.sec.gov/exch/2017-01-31" xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.spscommerce.com/20171231" xmlns="http://www.w3.org/2001/XMLSchema">
  <import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance" />
  <import schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/linkbase" />
  <import schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" namespace="http://xbrl.org/2005/xbrldt" />
  <import schemaLocation="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd" namespace="http://fasb.org/us-gaap/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd" namespace="http://xbrl.sec.gov/dei/2014-01-31" />
  <import schemaLocation="http://xbrl.fasb.org/us-gaap/2017/elts/us-types-2017-01-31.xsd" namespace="http://fasb.org/us-types/2017-01-31" />
  <import schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/numeric" />
  <import schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/non-numeric" />
  <import schemaLocation="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd" namespace="http://xbrl.sec.gov/country/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd" namespace="http://xbrl.sec.gov/currency/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/exch/2017/exch-2017-01-31.xsd" namespace="http://xbrl.sec.gov/exch/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" namespace="http://xbrl.sec.gov/invest/2013-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd" namespace="http://xbrl.sec.gov/naics/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" namespace="http://xbrl.sec.gov/sic/2011-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd" namespace="http://xbrl.sec.gov/stpr/2011-01-31" />
  <annotation>
    <appinfo>
      <link:roleType id="TemplateLink" roleURI="http://www.spscommerce.com/20171231/role/TemplateLink" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>00000 - Document - Template Link</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spsc-20171231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:title="Calculation Links, all" xlink:type="simple" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spsc-20171231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:title="Definition Links, all" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spsc-20171231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:title="Label Links, all" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spsc-20171231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:title="Presentation Links, all" xlink:type="simple" />
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DocumentDocumentAndEntityInformation" id="Role_DocumentDocumentAndEntityInformation">
        <link:definition>100000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/StatementConsolidatedBalanceSheets" id="Role_StatementConsolidatedBalanceSheets">
        <link:definition>100010 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" id="Role_StatementConsolidatedBalanceSheetsParenthetical">
        <link:definition>100020 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome" id="Role_StatementConsolidatedStatementsOfComprehensiveIncome">
        <link:definition>100030 - Statement - Consolidated Statements of Comprehensive Income</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical" id="Role_StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical">
        <link:definition>100040 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" id="Role_StatementConsolidatedStatementsOfStockholdersEquity">
        <link:definition>100050 - Statement - Consolidated Statements of Stockholders&apos; Equity</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" id="Role_StatementConsolidatedStatementsOfCashFlows">
        <link:definition>100060 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGeneral" id="Role_DisclosureGeneral">
        <link:definition>100070 - Disclosure - General</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureBusinessAcquisitions" id="Role_DisclosureBusinessAcquisitions">
        <link:definition>100080 - Disclosure - Business Acquisitions</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureFinancialInstruments" id="Role_DisclosureFinancialInstruments">
        <link:definition>100090 - Disclosure - Financial Instruments</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureAllowanceForDoubtfulAccounts" id="Role_DisclosureAllowanceForDoubtfulAccounts">
        <link:definition>100100 - Disclosure - Allowance for Doubtful Accounts</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosurePropertyAndEquipmentNet" id="Role_DisclosurePropertyAndEquipmentNet">
        <link:definition>100110 - Disclosure - Property and Equipment, net</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsNet" id="Role_DisclosureGoodwillAndIntangibleAssetsNet">
        <link:definition>100120 - Disclosure - Goodwill and Intangible Assets, net</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureCommitmentsAndContingencies" id="Role_DisclosureCommitmentsAndContingencies">
        <link:definition>100130 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockholdersEquity" id="Role_DisclosureStockholdersEquity">
        <link:definition>100140 - Disclosure - Stockholders&apos; Equity</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensation" id="Role_DisclosureStockBasedCompensation">
        <link:definition>100150 - Disclosure - Stock-Based Compensation</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureIncomeTaxes" id="Role_DisclosureIncomeTaxes">
        <link:definition>100160 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureNetIncomeLossPerShare" id="Role_DisclosureNetIncomeLossPerShare">
        <link:definition>100170 - Disclosure - Net Income (Loss) Per Share</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureRetirementSavingsPlan" id="Role_DisclosureRetirementSavingsPlan">
        <link:definition>100180 - Disclosure - Retirement Savings Plan</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureRelatedPartyTransactions" id="Role_DisclosureRelatedPartyTransactions">
        <link:definition>100190 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureSelectedQuarterlyFinancialDataUnaudited" id="Role_DisclosureSelectedQuarterlyFinancialDataUnaudited">
        <link:definition>100200 - Disclosure - Selected Quarterly Financial Data (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGeneralPolicies" id="Role_DisclosureGeneralPolicies">
        <link:definition>100210 - Disclosure - General (Policies)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureBusinessAcquisitionsTables" id="Role_DisclosureBusinessAcquisitionsTables">
        <link:definition>100220 - Disclosure - Business Acquisitions (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureFinancialInstrumentsTables" id="Role_DisclosureFinancialInstrumentsTables">
        <link:definition>100230 - Disclosure - Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureAllowanceForDoubtfulAccountsTables" id="Role_DisclosureAllowanceForDoubtfulAccountsTables">
        <link:definition>100240 - Disclosure - Allowance for Doubtful Accounts (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosurePropertyAndEquipmentNetTables" id="Role_DisclosurePropertyAndEquipmentNetTables">
        <link:definition>100250 - Disclosure - Property and Equipment, net (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsNetTables" id="Role_DisclosureGoodwillAndIntangibleAssetsNetTables">
        <link:definition>100260 - Disclosure - Goodwill and Intangible Assets, net (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureCommitmentsAndContingenciesTables" id="Role_DisclosureCommitmentsAndContingenciesTables">
        <link:definition>100270 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationTables" id="Role_DisclosureStockBasedCompensationTables">
        <link:definition>100280 - Disclosure - Stock-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureIncomeTaxesTables" id="Role_DisclosureIncomeTaxesTables">
        <link:definition>100290 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureNetIncomeLossPerShareTables" id="Role_DisclosureNetIncomeLossPerShareTables">
        <link:definition>100300 - Disclosure - Net Income (Loss) Per Share (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureSelectedQuarterlyFinancialDataUnauditedTables" id="Role_DisclosureSelectedQuarterlyFinancialDataUnauditedTables">
        <link:definition>100310 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGeneralAdditionalInformationDetail" id="Role_DisclosureGeneralAdditionalInformationDetail">
        <link:definition>100320 - Disclosure - General - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureBusinessAcquisitionsAdditionalInformationDetail" id="Role_DisclosureBusinessAcquisitionsAdditionalInformationDetail">
        <link:definition>100330 - Disclosure - Business Acquisitions - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureBusinessAcquisitionsBusinessPurchasePriceDetail" id="Role_DisclosureBusinessAcquisitionsBusinessPurchasePriceDetail">
        <link:definition>100340 - Disclosure - Business Acquisitions - Business Purchase Price (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureBusinessAcquisitionsEstimatedFairValuesOfAssetsAcquiredNetOfCashAcquiredAndLiabilitiesAssumedAtAcquisitionDateDetail" id="Role_DisclosureBusinessAcquisitionsEstimatedFairValuesOfAssetsAcquiredNetOfCashAcquiredAndLiabilitiesAssumedAtAcquisitionDateDetail">
        <link:definition>100350 - Disclosure - Business Acquisitions - Estimated Fair Values of the Assets Acquired, Net of Cash acquired and Liabilities Assumed at the Acquisition Date (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureBusinessAcquisitionsEstimatedFairValueOfPurchasedIntangibleAssetsAndEstimatedUsefulLivesDetail" id="Role_DisclosureBusinessAcquisitionsEstimatedFairValueOfPurchasedIntangibleAssetsAndEstimatedUsefulLivesDetail">
        <link:definition>100360 - Disclosure - Business Acquisitions - Estimated Fair Value of Purchased Intangible Assets and Estimated Useful Lives (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureBusinessAcquisitionsProFormaFinancialInformationDetail" id="Role_DisclosureBusinessAcquisitionsProFormaFinancialInformationDetail">
        <link:definition>100370 - Disclosure - Business Acquisitions - Pro Forma Financial Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfCashEquivalentsAndShortAndLongTermInvestmentsDetail" id="Role_DisclosureFinancialInstrumentsSummaryOfCashEquivalentsAndShortAndLongTermInvestmentsDetail">
        <link:definition>100380 - Disclosure - Financial Instruments - Summary of Cash Equivalents and Short and Long-term Investments (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfFinancialAssetsMeasuredAtFairValueOnRecurringBasisDetail" id="Role_DisclosureFinancialInstrumentsSummaryOfFinancialAssetsMeasuredAtFairValueOnRecurringBasisDetail">
        <link:definition>100390 - Disclosure - Financial Instruments - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureAllowanceForDoubtfulAccountsScheduleOfAllowanceForDoubtfulActivityIncludedInAccountsReceivableNetDetail" id="Role_DisclosureAllowanceForDoubtfulAccountsScheduleOfAllowanceForDoubtfulActivityIncludedInAccountsReceivableNetDetail">
        <link:definition>100400 - Disclosure - Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Activity Included in Accounts Receivable Net (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosurePropertyAndEquipmentNetScheduleOfPropertyAndEquipmentNetDetail" id="Role_DisclosurePropertyAndEquipmentNetScheduleOfPropertyAndEquipmentNetDetail">
        <link:definition>100410 - Disclosure - Property and Equipment, net - Schedule of Property and Equipment, Net (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosurePropertyAndEquipmentNetAdditionalInformationDetail" id="Role_DisclosurePropertyAndEquipmentNetAdditionalInformationDetail">
        <link:definition>100420 - Disclosure - Property and Equipment, net - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsNetScheduleOfChangesInNetCarryingAmountOfGoodwillDetail" id="Role_DisclosureGoodwillAndIntangibleAssetsNetScheduleOfChangesInNetCarryingAmountOfGoodwillDetail">
        <link:definition>100430 - Disclosure - Goodwill and Intangible Assets, net - Schedule of Changes in Net Carrying Amount of Goodwill (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsNetIntangibleAssetsDetail" id="Role_DisclosureGoodwillAndIntangibleAssetsNetIntangibleAssetsDetail">
        <link:definition>100440 - Disclosure - Goodwill and Intangible Assets, net - Intangible Assets (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsNetAdditionalInformationDetail" id="Role_DisclosureGoodwillAndIntangibleAssetsNetAdditionalInformationDetail">
        <link:definition>100450 - Disclosure - Goodwill and Intangible Assets, net - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsNetFutureAmortizationExpenseForIntangibleAssetsDetail" id="Role_DisclosureGoodwillAndIntangibleAssetsNetFutureAmortizationExpenseForIntangibleAssetsDetail">
        <link:definition>100460 - Disclosure - Goodwill and Intangible Assets, net - Future Amortization Expense for Intangible Assets (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail" id="Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail">
        <link:definition>100470 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureCommitmentsAndContingenciesFutureMinimumPaymentsUnderOperatingLeasesDetail" id="Role_DisclosureCommitmentsAndContingenciesFutureMinimumPaymentsUnderOperatingLeasesDetail">
        <link:definition>100480 - Disclosure - Commitments and Contingencies - Future Minimum Payments Under Operating Leases (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockholdersEquityAdditionalInformationDetail" id="Role_DisclosureStockholdersEquityAdditionalInformationDetail">
        <link:definition>100490 - Disclosure - Stockholders&apos; Equity - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" id="Role_DisclosureStockBasedCompensationAdditionalInformationDetail">
        <link:definition>100500 - Disclosure - Stock-Based Compensation - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationStockBasedCompensationExpenseDetail" id="Role_DisclosureStockBasedCompensationStockBasedCompensationExpenseDetail">
        <link:definition>100510 - Disclosure - Stock-Based Compensation - Stock-Based Compensation Expense (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationStockOptionActivityDetail" id="Role_DisclosureStockBasedCompensationStockOptionActivityDetail">
        <link:definition>100520 - Disclosure - Stock-Based Compensation - Stock Option Activity (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationWeightedAverageFairValuePerShareOfOptionsGrantedAssumptionsDetail" id="Role_DisclosureStockBasedCompensationWeightedAverageFairValuePerShareOfOptionsGrantedAssumptionsDetail">
        <link:definition>100530 - Disclosure - Stock-Based Compensation - Weighted Average Fair Value Per Share of Options Granted, Assumptions (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationPerformanceShareUnitsAndRestrictedStockUnitsDetail" id="Role_DisclosureStockBasedCompensationPerformanceShareUnitsAndRestrictedStockUnitsDetail">
        <link:definition>100540 - Disclosure - Stock-Based Compensation - Performance Share Units and Restricted Stock Units (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationRestrictedStockAwardsDetail" id="Role_DisclosureStockBasedCompensationRestrictedStockAwardsDetail">
        <link:definition>100550 - Disclosure - Stock-Based Compensation - Restricted Stock Awards (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureStockBasedCompensationFairValueEstimationOfCommonStockUsingBlackScholesOptionPricingModelWeightedAverageAssumptionsDetail" id="Role_DisclosureStockBasedCompensationFairValueEstimationOfCommonStockUsingBlackScholesOptionPricingModelWeightedAverageAssumptionsDetail">
        <link:definition>100560 - Disclosure - Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Weighted-Average Assumptions (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureIncomeTaxesScheduleOfProvisionForIncomeTaxesDetail" id="Role_DisclosureIncomeTaxesScheduleOfProvisionForIncomeTaxesDetail">
        <link:definition>100570 - Disclosure - Income Taxes - Schedule of Provision for Income Taxes (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail" id="Role_DisclosureIncomeTaxesAdditionalInformationDetail">
        <link:definition>100580 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureIncomeTaxesReconciliationOfProvisionForIncomeTaxesToStatutoryFederalRateDetail" id="Role_DisclosureIncomeTaxesReconciliationOfProvisionForIncomeTaxesToStatutoryFederalRateDetail">
        <link:definition>100590 - Disclosure - Income Taxes - Reconciliation of Provision for Income Taxes to Statutory Federal Rate (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureIncomeTaxesSignificantComponentsOfDeferredTaxAssetsLiabilitiesDetail" id="Role_DisclosureIncomeTaxesSignificantComponentsOfDeferredTaxAssetsLiabilitiesDetail">
        <link:definition>100600 - Disclosure - Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsOfComputationOfBasicAndDilutedNetIncomeLossPerShareDetail" id="Role_DisclosureNetIncomeLossPerShareComponentsOfComputationOfBasicAndDilutedNetIncomeLossPerShareDetail">
        <link:definition>100610 - Disclosure - Net Income (Loss) Per Share - Components of Computation of Basic and Diluted Net Income (Loss) Per Share (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureNetIncomeLossPerShareAdditionalInformationDetail" id="Role_DisclosureNetIncomeLossPerShareAdditionalInformationDetail">
        <link:definition>100620 - Disclosure - Net Income (Loss) Per Share - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureRetirementSavingsPlanAdditionalInformationDetail" id="Role_DisclosureRetirementSavingsPlanAdditionalInformationDetail">
        <link:definition>100630 - Disclosure - Retirement Savings Plan - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetail" id="Role_DisclosureRelatedPartyTransactionsAdditionalInformationDetail">
        <link:definition>100640 - Disclosure - Related Party Transactions - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.spscommerce.com/20171231/taxonomy/role/DisclosureSelectedQuarterlyFinancialDataUnauditedSummaryOfUnauditedQuarterlyStatementsOfComprehensiveIncomeDataDetail" id="Role_DisclosureSelectedQuarterlyFinancialDataUnauditedSummaryOfUnauditedQuarterlyStatementsOfComprehensiveIncomeDataDetail">
        <link:definition>100650 - Disclosure - Selected Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Statements of Comprehensive Income Data (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </appinfo>
  </annotation>
  <element id="spsc_FinancialInstrumentGrossUnrealizedGainLossBeforeTax" name="FinancialInstrumentGrossUnrealizedGainLossBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_FinancialInstrumentsFairValue" name="FinancialInstrumentsFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_IncomeTaxRateReconciliationPermanentDifferences" name="IncomeTaxRateReconciliationPermanentDifferences" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_IncomeTaxReconciliationChangeInStateDeferredRate" name="IncomeTaxReconciliationChangeInStateDeferredRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit" name="TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_IncomeTaxReconciliationTaxBenefitsForExcessTaxDeductionFromStockActivity" name="IncomeTaxReconciliationTaxBenefitsForExcessTaxDeductionFromStockActivity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_StockIssuedDuringPeriodSharesRestrictedStockAndStockOptionsExercised" name="StockIssuedDuringPeriodSharesRestrictedStockAndStockOptionsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_StockIssuedDuringPeriodValueRestrictedStockAndStockOptionsExercised" name="StockIssuedDuringPeriodValueRestrictedStockAndStockOptionsExercised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_ReclassificationOfLossesOnInvestmentsIntoEarnings" name="ReclassificationOfLossesOnInvestmentsIntoEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_StockRetirementOfEscrowSharesDuringPeriodShares" name="StockRetirementOfEscrowSharesDuringPeriodShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_StockRetirementOfEscrowSharesDuringPeriodValue" name="StockRetirementOfEscrowSharesDuringPeriodValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_PaymentsToAcquireBusinessesNetOfCashAcquiredAndIntangibleAssets" name="PaymentsToAcquireBusinessesNetOfCashAcquiredAndIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_AllowanceForDoubtfulAccountsTextBlock" name="AllowanceForDoubtfulAccountsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_RiskAndUncertaintiesPolicyTextBlock" name="RiskAndUncertaintiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_InvestmentsPolicyTextBlock" name="InvestmentsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_BusinessAcquisitionCostOfAcquiredEntityDescriptionOfPurchasePriceComponentsTableTextBlock" name="BusinessAcquisitionCostOfAcquiredEntityDescriptionOfPurchasePriceComponentsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_CashEquivalentsAndOtherInvestmentsDisclosureTableTextBlock" name="CashEquivalentsAndOtherInvestmentsDisclosureTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_RestrictedStockUnitsAndPerformanceShareUnitsMember" name="RestrictedStockUnitsAndPerformanceShareUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_RegulatoryAssetsAbstract" name="RegulatoryAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ScheduleOfAccountingPoliciesLineItems" name="ScheduleOfAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ScheduleOfAccountingPoliciesTable" name="ScheduleOfAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ComputerEquipmentAndSoftwareMember" name="ComputerEquipmentAndSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_OfficeEquipmentAndFurnitureMember" name="OfficeEquipmentAndFurnitureMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_TechnologyAndOtherMember" name="TechnologyAndOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_DeferredTaxAssetsNoncurrentMember" name="DeferredTaxAssetsNoncurrentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_RetainedEarningsAccumulatedDeficitMember" name="RetainedEarningsAccumulatedDeficitMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ExpectedLifeOfConnection" name="ExpectedLifeOfConnection" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnRevenues" name="NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnRevenues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_IncreaseDecreaseInCommissionExpense" name="IncreaseDecreaseInCommissionExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_ToolboxSolutionsIncorporationMember" name="ToolboxSolutionsIncorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ContingentConsiderationLiabilityMember" name="ContingentConsiderationLiabilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssuedGross" name="BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssuedGross" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="spsc_BusinessCombinationShareReturnedFromEscrow" name="BusinessCombinationShareReturnedFromEscrow" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_ScheduleOfBusinessAcquisitionsPurchasePriceAllocationLineItems" name="ScheduleOfBusinessAcquisitionsPurchasePriceAllocationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ScheduleOfBusinessAcquisitionsPurchasePriceAllocationTable" name="ScheduleOfBusinessAcquisitionsPurchasePriceAllocationTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_DevelopedTechnologyMember" name="DevelopedTechnologyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_BusinessAcquisitionsProFormaAdjustmentToAmortizationExpense" name="BusinessAcquisitionsProFormaAdjustmentToAmortizationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_BusinessAcquisitionProformaInformationStatutoryTaxRateOfAcquiree" name="BusinessAcquisitionProformaInformationStatutoryTaxRateOfAcquiree" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_FinancialInstrumentsMaturitiesWithinOneYearFairValue" name="FinancialInstrumentsMaturitiesWithinOneYearFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_FinancialInstrumentAmortizedCostBasis" name="FinancialInstrumentAmortizedCostBasis" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_FinancialInstrumentsMaturitiesAfterOneThroughFiveYearsFairValue" name="FinancialInstrumentsMaturitiesAfterOneThroughFiveYearsFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_ScheduleOfFinancialInstrumentsLineItems" name="ScheduleOfFinancialInstrumentsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ScheduleOfFinancialInstrumentsTable" name="ScheduleOfFinancialInstrumentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_FinancialInstrumentsMember" name="FinancialInstrumentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_CashEquivalentsAbstract" name="CashEquivalentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_PropertyPlantAndEquipmentUsefulLifeAndValuesAbstract" name="PropertyPlantAndEquipmentUsefulLifeAndValuesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_CommitmentsAndContingenciesLineItems" name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_CommitmentsAndContingenciesTable" name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_FourthAmendmentToLeaseAgreementRelatedToCurrentHeadquartersLocationMember" name="FourthAmendmentToLeaseAgreementRelatedToCurrentHeadquartersLocationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_NumberOfOptionsToExtendLease" name="NumberOfOptionsToExtendLease" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_IncentivesReceivedUponExecutionOfAmendment" name="IncentivesReceivedUponExecutionOfAmendment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_AreaOfLeasedSpace" name="AreaOfLeasedSpace" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="spsc_AdditionalAreaOfLeaseSpace" name="AdditionalAreaOfLeaseSpace" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="spsc_ScheduleOfStockholdersEquityLineItems" name="ScheduleOfStockholdersEquityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ScheduleOfStockholdersEquityTable" name="ScheduleOfStockholdersEquityTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_TwoThousandTenMember" name="TwoThousandTenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_PerformanceShareUnitsMember" name="PerformanceShareUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnissuedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnissuedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_NumberOfOfferings" name="NumberOfOfferings" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="spsc_EmployeeStockPurchasePlanEmployeesContribution" name="EmployeeStockPurchasePlanEmployeesContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_ReclassificationOfAlternativeMinimumTaxCreditCarryForward" name="ReclassificationOfAlternativeMinimumTaxCreditCarryForward" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_UnutilizedAlternativeMinimumTaxCreditCarryforwardsFullyRefundableYear" name="UnutilizedAlternativeMinimumTaxCreditCarryforwardsFullyRefundableYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_UnutilizedAlternativeMinimumTaxCreditCarryforwardsPartiallyRefundableYearOne" name="UnutilizedAlternativeMinimumTaxCreditCarryforwardsPartiallyRefundableYearOne" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_UnutilizedAlternativeMinimumTaxCreditCarryforwardsPartiallyRefundableYearTwo" name="UnutilizedAlternativeMinimumTaxCreditCarryforwardsPartiallyRefundableYearTwo" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_UnutilizedAlternativeMinimumTaxCreditCarryforwardsPartiallyRefundableYearThree" name="UnutilizedAlternativeMinimumTaxCreditCarryforwardsPartiallyRefundableYearThree" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_IncomeTaxExpenseBenefitLineItems" name="IncomeTaxExpenseBenefitLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_IncomeTaxExpenseBenefitTable" name="IncomeTaxExpenseBenefitTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_NetOperatingLossAndCreditCarryforwardsMember" name="NetOperatingLossAndCreditCarryforwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards" name="DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherFiniteLivedAssets" name="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherFiniteLivedAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="spsc_OperatingLossCarryforwardsExpirationDateOne" name="OperatingLossCarryforwardsExpirationDateOne" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_OperatingLossCarryforwardExpirableUnusedAmount" name="OperatingLossCarryforwardExpirableUnusedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_OperatingLossCarryforwardsLimitationsOnUseAmount" name="OperatingLossCarryforwardsLimitationsOnUseAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_TaxCreditCarryforwardBeginningExpirationYear" name="TaxCreditCarryforwardBeginningExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="spsc_EstimatedTaxOnMandatoryDeemedRepatriationDueToNetForeignEarningsAndProfitsDeficit" name="EstimatedTaxOnMandatoryDeemedRepatriationDueToNetForeignEarningsAndProfitsDeficit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="spsc_NetIncomePerShareAbstract" name="NetIncomePerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="spsc_NonProfitOrganizationMember" name="NonProfitOrganizationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</schema>
