<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-02-23T02:52:32.6622618+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : deb4c70e108a40e592e5ef891dcfd61c -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="spsc_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherFiniteLivedAssets" name="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherFiniteLivedAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_StockIssuedDuringPeriodSharesRestrictedStockAndStockOptionsExercised" name="StockIssuedDuringPeriodSharesRestrictedStockAndStockOptionsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_StockIssuedDuringPeriodValueRestrictedStockAndStockOptionsExercised" name="StockIssuedDuringPeriodValueRestrictedStockAndStockOptionsExercised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_ReclassificationOfGainLossOnInvestmentsInToEarningsNetOfTax" name="ReclassificationOfGainLossOnInvestmentsInToEarningsNetOfTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_IncreaseDecreaseInOperatingLeases" name="IncreaseDecreaseInOperatingLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_PaymentsToAcquireBusinessesAndIntangibleAssetsNetOfCashAcquired" name="PaymentsToAcquireBusinessesAndIntangibleAssetsNetOfCashAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_PaymentForEarnOutLiability" name="PaymentForEarnOutLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_NonCashFinancingPaymentsProceedsFromPropertyAndEquipment" name="NonCashFinancingPaymentsProceedsFromPropertyAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_DeferredCostsDisclosureTextBlock" name="DeferredCostsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_GeographicInformationTextBlock" name="GeographicInformationTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_BusinessDescriptionPolicyPolicyTextBlock" name="BusinessDescriptionPolicyPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_RiskAndUncertaintiesPolicyTextBlock" name="RiskAndUncertaintiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_InvestmentsPolicyTextBlock" name="InvestmentsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_DataMasonsMember" name="DataMasonsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_DeferredCostsAndAmortizationTableTextBlock" name="DeferredCostsAndAmortizationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_SummaryOfNonCancellableOperatingLeasesPrimarilyForOfficeSpaceAndCertainEquipmentTableTextBlock" name="SummaryOfNonCancellableOperatingLeasesPrimarilyForOfficeSpaceAndCertainEquipmentTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" name="ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" name="ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_PerformanceShareUnitsRestrictedStockUnitsRestrictedStockAwardsAndDeferredStockUnitsMember" name="PerformanceShareUnitsRestrictedStockUnitsRestrictedStockAwardsAndDeferredStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_RegulatoryAssetsAbstract" name="RegulatoryAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_ScheduleOfAccountingPoliciesLineItems" name="ScheduleOfAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_ScheduleOfAccountingPoliciesTable" name="ScheduleOfAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_ComputerEquipmentAndSoftwareMember" name="ComputerEquipmentAndSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_OfficeEquipmentAndFurnitureMember" name="OfficeEquipmentAndFurnitureMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_InternalUseSoftwareMember" name="InternalUseSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_StockDividendPercentageInStockSplit" name="StockDividendPercentageInStockSplit" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_SoftwareHostingServicesArrangementPeriod" name="SoftwareHostingServicesArrangementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_DeferredCommissionExpectedAmortizationPeriod" name="DeferredCommissionExpectedAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_BusinessCombinationDueFromSellersRelatedWithinInitialNetWorkingCapitalAdjustment" name="BusinessCombinationDueFromSellersRelatedWithinInitialNetWorkingCapitalAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_PPPLoanMember" name="PPPLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_FormerOwnersMember" name="FormerOwnersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_LoanAndAccruedInterestBalanceInEscrow" name="LoanAndAccruedInterestBalanceInEscrow" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_BusinessCombinationNonCurrentDebtClassifiedWithAccruedExpenses" name="BusinessCombinationNonCurrentDebtClassifiedWithAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndNonCurrentAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndNonCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_ScheduleOfBusinessAcquisitionsPurchasePriceAllocationLineItems" name="ScheduleOfBusinessAcquisitionsPurchasePriceAllocationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_ScheduleOfBusinessAcquisitionsPurchasePriceAllocationTable" name="ScheduleOfBusinessAcquisitionsPurchasePriceAllocationTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_DevelopedTechnologyMember" name="DevelopedTechnologyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_RevenueRecognitionLineItems" name="RevenueRecognitionLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_RevenueRecognitionTable" name="RevenueRecognitionTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_FulfillmentMember" name="FulfillmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_AnalyticsMember" name="AnalyticsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_OtherMember" name="OtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_RecurringRevenuesMember" name="RecurringRevenuesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_OneTimeRevenuesMember" name="OneTimeRevenuesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_CustomerContractCancellationPeriod" name="CustomerContractCancellationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_RecurringRevenuesTimingOfBillingsLatestPeriod" name="RecurringRevenuesTimingOfBillingsLatestPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_RecurringRevenuesTimingOfBillingsEarliestPeriodDescription" name="RecurringRevenuesTimingOfBillingsEarliestPeriodDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_DeferredRevenueRecognitionPeriod" name="DeferredRevenueRecognitionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_RevenueRemainingPerformanceObligationForContractsOriginalDurations" name="RevenueRemainingPerformanceObligationForContractsOriginalDurations" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_EstimatedPeriodForMaterialRightsPresentToCustomers" name="EstimatedPeriodForMaterialRightsPresentToCustomers" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_SetUpFeesRecognizedPeriod" name="SetUpFeesRecognizedPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_DeferredRevenueInvoicedSetUpFees" name="DeferredRevenueInvoicedSetUpFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_DeferredRevenueAmortizedSetUpFees" name="DeferredRevenueAmortizedSetUpFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_SetUpFeesMember" name="SetUpFeesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_CurrentAmountRecognitionPeriodOfSetUpFees" name="CurrentAmountRecognitionPeriodOfSetUpFees" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_LongTermAmountRecognitionPeriodOfSetUpFees" name="LongTermAmountRecognitionPeriodOfSetUpFees" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_MaximumRecognitionPeriodForMiscellaneousOneTimeFee" name="MaximumRecognitionPeriodForMiscellaneousOneTimeFee" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_DeferredCostsIncurred" name="DeferredCostsIncurred" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_DeferredCostsAmortized" name="DeferredCostsAmortized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_FinancialInstrumentsMaturitiesWithinOneYearFairValue" name="FinancialInstrumentsMaturitiesWithinOneYearFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_FinancialInstrumentsMaturitiesWithinOneToTwoYearFairValue" name="FinancialInstrumentsMaturitiesWithinOneToTwoYearFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_FinancialInstrumentAmortizedCostBasis" name="FinancialInstrumentAmortizedCostBasis" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_FinancialInstrumentNetUnrealizedGainLossBeforeTax" name="FinancialInstrumentNetUnrealizedGainLossBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_FinancialInstrumentsFairValue" name="FinancialInstrumentsFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_ScheduleOfFinancialInstrumentsLineItems" name="ScheduleOfFinancialInstrumentsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_ScheduleOfFinancialInstrumentsTable" name="ScheduleOfFinancialInstrumentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_CashEquivalentsAbstract" name="CashEquivalentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_DataMasonsContingentConsiderationMember" name="DataMasonsContingentConsiderationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_EDIAdminEarnOutLiabilityMember" name="EDIAdminEarnOutLiabilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_EarnOutLiabilityExpectedToBePaidOnCompletionOfRevenueMilestones" name="EarnOutLiabilityExpectedToBePaidOnCompletionOfRevenueMilestones" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_ContingentConsiderationTransferredOutOfFairValueHierarchyFromLevel3" name="ContingentConsiderationTransferredOutOfFairValueHierarchyFromLevel3" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_GainDueToRemeasurementOfContingentLiability" name="GainDueToRemeasurementOfContingentLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_EDIAdminMember" name="EDIAdminMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_PropertyPlantAndEquipmentUsefulLifeAndValuesAbstract" name="PropertyPlantAndEquipmentUsefulLifeAndValuesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_OtherLeasesMember" name="OtherLeasesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_AreaOfLeasedSpace" name="AreaOfLeasedSpace" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="spsc_NumberOfOptionsToExtendLease" name="NumberOfOptionsToExtendLease" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_IncentivesReceivedUponExecutionOfAmendment" name="IncentivesReceivedUponExecutionOfAmendment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_CommitmentsAndContingenciesLineItems" name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_CommitmentsAndContingenciesTable" name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_FifthAmendmentToLeaseAgreementRelatedToCurrentHeadquartersLocationMember" name="FifthAmendmentToLeaseAgreementRelatedToCurrentHeadquartersLocationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_LeaseAgreementExpiresOnMayThirtyOneThousandTwentyFiveMember" name="LeaseAgreementExpiresOnMayThirtyOneThousandTwentyFiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_IncreaseDecreaseInCommonStockSharesAuthorized" name="IncreaseDecreaseInCommonStockSharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_ScheduleOfStockholdersEquityLineItems" name="ScheduleOfStockholdersEquityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_ScheduleOfStockholdersEquityTable" name="ScheduleOfStockholdersEquityTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_StockRepurchaseProgram1Member" name="StockRepurchaseProgram1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_StockRepurchaseProgramAuthorizedRepurchaseAmountExpired" name="StockRepurchaseProgramAuthorizedRepurchaseAmountExpired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="spsc_TwoThousandTenMember" name="TwoThousandTenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_DeferredStockUnitsMember" name="DeferredStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_PerformanceShareUnitsRestrictedStockUnitsAndDeferredStockUnitsMember" name="PerformanceShareUnitsRestrictedStockUnitsAndDeferredStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_RestrictedStockAwardsAndDeferredStockUnitsMember" name="RestrictedStockAwardsAndDeferredStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_FourZeroOneKStockMatchMember" name="FourZeroOneKStockMatchMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_AllocatedShareBasedCompensationExpenseReversal" name="AllocatedShareBasedCompensationExpenseReversal" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfDelayedReceiptOfCommonShares" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfDelayedReceiptOfCommonShares" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnissuedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnissuedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_NumberOfOfferings" name="NumberOfOfferings" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="spsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardValuePurchasedForAward" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardValuePurchasedForAward" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_OperatingLossCarryforwardsExpirationDateOne" name="OperatingLossCarryforwardsExpirationDateOne" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_IncomeTaxExpenseBenefitLineItems" name="IncomeTaxExpenseBenefitLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_IncomeTaxExpenseBenefitTable" name="IncomeTaxExpenseBenefitTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_NetOperatingLossAndCreditCarryforwardsMember" name="NetOperatingLossAndCreditCarryforwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_OperatingLossCarryforwardExpirableUnusedAmount" name="OperatingLossCarryforwardExpirableUnusedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_TaxCreditCarryforwardBeginningExpirationYear" name="TaxCreditCarryforwardBeginningExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="spsc_NetIncomePerShareAbstract" name="NetIncomePerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_DefinedContributionPlanEmployerNotNoteDiscretionaryContributionAmount" name="DefinedContributionPlanEmployerNotNoteDiscretionaryContributionAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="spsc_NonProfitOrganizationMember" name="NonProfitOrganizationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="spsc_NumberOfJurisdictionOutsideUSHadExcessRevenueOfTenPercentage" name="NumberOfJurisdictionOutsideUSHadExcessRevenueOfTenPercentage" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
</xsd:schema>
