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  <xs:element id="cart_IncomeTaxesPotentialTaxInterestOrPenaltiesNetReserveReleaseAmount" abstract="false" name="IncomeTaxesPotentialTaxInterestOrPenaltiesNetReserveReleaseAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SeriesB1ConvertiblePreferredStockMember" abstract="true" name="SeriesB1ConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="cart_EffectiveIncomeTaxRateReconciliationEquityAgreementsWithRetailersPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationEquityAgreementsWithRetailersPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsIssuedInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsIssuedInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_StockExchangedDuringPeriodShares" abstract="false" name="StockExchangedDuringPeriodShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_AdvancesFromPaymentCardIssuerPolicyPolicyTextBlock" abstract="false" name="AdvancesFromPaymentCardIssuerPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cart_July2018RetailerSubscriptionAgreementMember" abstract="true" name="July2018RetailerSubscriptionAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_MorganFongRuleTradingArrangementExerciseCommonStockMember" abstract="true" name="MorganFongRuleTradingArrangementExerciseCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesModified" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesModified" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_SaleOfStockCancelled" abstract="false" name="SaleOfStockCancelled" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_ShareBasedPaymentArrangementAmountCapitalizedAsInternalUseSoftware" abstract="false" name="ShareBasedPaymentArrangementAmountCapitalizedAsInternalUseSoftware" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_A36And48MonthAnniversaryMember" abstract="true" name="A36And48MonthAnniversaryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_MorganFongMember" abstract="true" name="MorganFongMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_MarketableSecuritiesImpairmentLoss" abstract="false" name="MarketableSecuritiesImpairmentLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SaleOfStockExpectedTerm" abstract="false" name="SaleOfStockExpectedTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_IncomeTaxesPotentialTaxClosingOfSaleAndUseTaxExaminationIncreaseDecreaseInReserveAmount" abstract="false" name="IncomeTaxesPotentialTaxClosingOfSaleAndUseTaxExaminationIncreaseDecreaseInReserveAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SaleOfStockVested" abstract="false" name="SaleOfStockVested" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_TransactionReceivableMember" abstract="true" name="TransactionReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_DeferredOfferingCostsIncurredButNotYetPaid" abstract="false" name="DeferredOfferingCostsIncurredButNotYetPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SaleOfStockVolatilityRate" abstract="false" name="SaleOfStockVolatilityRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodSharesCommonStockUponExerciseOfWarrants" abstract="false" name="StockIssuedDuringPeriodSharesCommonStockUponExerciseOfWarrants" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirationsWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirationsWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="cart_MorganFongRuleTradingArrangementCommonStockMember" abstract="true" name="MorganFongRuleTradingArrangementCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_SaleOfStockAnniversaryTerm2" abstract="false" name="SaleOfStockAnniversaryTerm2" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_LesseeOperatingLeaseTerminateTerm" abstract="false" name="LesseeOperatingLeaseTerminateTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_TransactionRevenuePolicyTextBlock" abstract="false" name="TransactionRevenuePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cart_ReclassificationOfDeferredOfferingCostsToAdditionalPaidInCapitalUponInitialPublicOffering" abstract="false" name="ReclassificationOfDeferredOfferingCostsToAdditionalPaidInCapitalUponInitialPublicOffering" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ServiceBasedVestingConditionsMember" abstract="true" name="ServiceBasedVestingConditionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsIssuedInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsIssuedInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="cart_OperationsAndSupportExpenseMember" abstract="true" name="OperationsAndSupportExpenseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_A2023PlanMember" abstract="true" name="A2023PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightExercisedCancelledOrExpired" abstract="false" name="ClassOfWarrantOrRightExercisedCancelledOrExpired" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_RSUsAndRestrictedStockMember" abstract="true" name="RSUsAndRestrictedStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodValueWarrantsExercised" abstract="false" name="StockIssuedDuringPeriodValueWarrantsExercised" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ExchangeableSharesOutstandingMember" abstract="true" name="ExchangeableSharesOutstandingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ExchangeableStockValueIssued" abstract="false" name="ExchangeableStockValueIssued" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightExpired" abstract="false" name="ClassOfWarrantOrRightExpired" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_NumberOfShareholders" abstract="false" name="NumberOfShareholders" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsSharesExchangedInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsSharesExchangedInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="cart_AmortizationOfCommonStockWarrants" abstract="false" name="AmortizationOfCommonStockWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndNotSettledInPeriodWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndNotSettledInPeriodWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightWarrantsOutstandingIntrinsicValue" abstract="false" name="ClassOfWarrantOrRightWarrantsOutstandingIntrinsicValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightVested" abstract="false" name="ClassOfWarrantOrRightVested" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodSharesNonVotingCommonStockAcquisitions" abstract="false" name="StockIssuedDuringPeriodSharesNonVotingCommonStockAcquisitions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_VolumeWeightedAveragePriceConsecutiveTradingDays" abstract="false" name="VolumeWeightedAveragePriceConsecutiveTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_SaleOfStockAnniversaryTerm4" abstract="false" name="SaleOfStockAnniversaryTerm4" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_PerformanceAndOrMarketBasedConditionsMember" abstract="true" name="PerformanceAndOrMarketBasedConditionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightNumberOfTimeOrPerformanceBasedMilestonesAchievement" abstract="false" name="ClassOfWarrantOrRightNumberOfTimeOrPerformanceBasedMilestonesAchievement" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cart_IncomeTaxesPotentialTaxInterestOrPenaltiesIncreaseDecreaseInReserveAmount" abstract="false" name="IncomeTaxesPotentialTaxInterestOrPenaltiesIncreaseDecreaseInReserveAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_AccrualForIncomeTaxesAndOtherTaxesCurrent" abstract="false" name="AccrualForIncomeTaxesAndOtherTaxesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SaleOfStockOutstanding" abstract="false" name="SaleOfStockOutstanding" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_November2017RetailerWarrantsPerformanceBasedMilestoneMember" abstract="true" name="November2017RetailerWarrantsPerformanceBasedMilestoneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_AmortizationAndRemeasurementOfCommonStockIssuable" abstract="false" name="AmortizationAndRemeasurementOfCommonStockIssuable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SharesAvailableForFutureGrantMember" abstract="true" name="SharesAvailableForFutureGrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_AlanRamsayRuleTradingArrangementVestedCommonStockMember" abstract="true" name="AlanRamsayRuleTradingArrangementVestedCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" abstract="false" name="TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_DeferredTaxLiabilitiesPropertyEquipmentAndIntangibleAssets" abstract="false" name="DeferredTaxLiabilitiesPropertyEquipmentAndIntangibleAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_MorganFongRuleTradingArrangementVestedCommonStockMember" abstract="true" name="MorganFongRuleTradingArrangementVestedCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightWarrantsOutstandingWeightedAverageRemainingContractualTerm" abstract="false" name="ClassOfWarrantOrRightWarrantsOutstandingWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_SeriesIPreferredStockMember" abstract="true" name="SeriesIPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_AdvertisingAndOtherMember" abstract="true" name="AdvertisingAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodSharesNonVotingCommonStock" abstract="false" name="StockIssuedDuringPeriodSharesNonVotingCommonStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightExpirationDuration" abstract="false" name="ClassOfWarrantOrRightExpirationDuration" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_RosieMember" abstract="true" name="RosieMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_SaleOfStockNumberOfTimeBasedMilestonesAchievement" abstract="false" name="SaleOfStockNumberOfTimeBasedMilestonesAchievement" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cart_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" abstract="false" name="PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodSharesNonVotingCommonStockInConnectionWithSubscriptionAgreement" abstract="false" name="StockIssuedDuringPeriodSharesNonVotingCommonStockInConnectionWithSubscriptionAgreement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_ChangeInControlAgreementApplicableAwardPercentage" abstract="false" name="ChangeInControlAgreementApplicableAwardPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_OperationsAndSupportExpense" abstract="false" name="OperationsAndSupportExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_July2018RetailerWarrantsMember" abstract="true" name="July2018RetailerWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedWeightedAverageModificationDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedWeightedAverageModificationDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="cart_SaleOfStockDiscountForLackOfMarketability" abstract="false" name="SaleOfStockDiscountForLackOfMarketability" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightAnniversaryTerm1" abstract="false" name="ClassOfWarrantOrRightAnniversaryTerm1" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_CustomerDMember" abstract="true" name="CustomerDMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_CustomerAMember" abstract="true" name="CustomerAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightWarrantsVestedWeightedAverageRemainingContractualTerm" abstract="false" name="ClassOfWarrantOrRightWarrantsVestedWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_TemporaryEquityIssuancePricePerShare" abstract="false" name="TemporaryEquityIssuancePricePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="cart_NonVotingCommonStockMember" abstract="true" name="NonVotingCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightAnniversaryTerm2" abstract="false" name="ClassOfWarrantOrRightAnniversaryTerm2" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_LongLivedAssetsNetTableTextBlock" abstract="false" name="LongLivedAssetsNetTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cart_AntidilutiveSecuritiesConditionAxis" abstract="true" name="AntidilutiveSecuritiesConditionAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="cart_ShortTermMarketableSecuritiesMember" abstract="true" name="ShortTermMarketableSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesIssuedUponExercise" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesIssuedUponExercise" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_FidjiSimoMember" abstract="true" name="FidjiSimoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_MeasurementOfOperatingLeaseLiabilitiesCashPaid" abstract="false" name="MeasurementOfOperatingLeaseLiabilitiesCashPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_CommonStockWarrantAmortization" abstract="false" name="CommonStockWarrantAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_VestedButNotSettledRestrictedStockUnitsMember" abstract="true" name="VestedButNotSettledRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ProceedsFromModificationOfCommonStockWarrants" abstract="false" name="ProceedsFromModificationOfCommonStockWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_AlanRamsayMember" abstract="true" name="AlanRamsayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_AshaSharmaMember" abstract="true" name="AshaSharmaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_CommonStockWarrantsModification" abstract="false" name="CommonStockWarrantsModification" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SaleOfStockDividendRateApprovalThreshold" abstract="false" name="SaleOfStockDividendRateApprovalThreshold" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_EffectiveIncomeTaxRateReconciliationLobbyingExpensesPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationLobbyingExpensesPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_TemporaryEquityDisclosureTextBlock" abstract="false" name="TemporaryEquityDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsSharesExchangedInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsSharesExchangedInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightVestingDurationThereafter" abstract="false" name="ClassOfWarrantOrRightVestingDurationThereafter" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_PerformanceBasedVestingConditionMember" abstract="true" name="PerformanceBasedVestingConditionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ChangesInAccruedPurchasesOfPropertyAndEquipmentIncludingCapitalizedInternalUseSoftware" abstract="false" name="ChangesInAccruedPurchasesOfPropertyAndEquipmentIncludingCapitalizedInternalUseSoftware" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightAnniversaryTerm" abstract="false" name="ClassOfWarrantOrRightAnniversaryTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_AlanRamsayRuleTradingArrangementCommonStockMember" abstract="true" name="AlanRamsayRuleTradingArrangementCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_AntidilutiveSecuritiesConditionDomain" abstract="true" name="AntidilutiveSecuritiesConditionDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightAnniversaryTerm3" abstract="false" name="ClassOfWarrantOrRightAnniversaryTerm3" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_SubscriptionAgreementMember" abstract="true" name="SubscriptionAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_EversightMember" abstract="true" name="EversightMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ExchangeableSharesMember" abstract="true" name="ExchangeableSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_EffectiveIncomeTaxRateReconciliationPenaltiesPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationPenaltiesPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cart_EffectiveIncomeTaxRateReconciliationTransactionCostsPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationTransactionCostsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_ScheduleOfWeightedAverageLeaseTermAndDiscountRateTableTextBlock" abstract="false" name="ScheduleOfWeightedAverageLeaseTermAndDiscountRateTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cart_BusinessCombinationIssuanceOfNonVotingCommonStockFairValueAmount" abstract="false" name="BusinessCombinationIssuanceOfNonVotingCommonStockFairValueAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_BusinessCombinationContingentConsiderationFairValue" abstract="false" name="BusinessCombinationContingentConsiderationFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="cart_DeferredTaxAssetsOperatingLeaseLiabilities" abstract="false" name="DeferredTaxAssetsOperatingLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SeriesI1PreferredStockMember" abstract="true" name="SeriesI1PreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_EverySixMonthsThereafterMember" abstract="true" name="EverySixMonthsThereafterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_AccruedShopperAndMerchantLiabilityCurrent" abstract="false" name="AccruedShopperAndMerchantLiabilityCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ServiceBasedVestingConditionMember" abstract="true" name="ServiceBasedVestingConditionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_November2017RetailerWarrantsMember" abstract="true" name="November2017RetailerWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_SharesAuthorized" abstract="false" name="SharesAuthorized" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_SaleOfStockMinimumReturnRate" abstract="false" name="SaleOfStockMinimumReturnRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cart_VolumeWeightedAveragePriceMeasuringPeriod" abstract="false" name="VolumeWeightedAveragePriceMeasuringPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_CommonStockWarrantIssuablePursuantToSubscriptionAgreementAmortization" abstract="false" name="CommonStockWarrantIssuablePursuantToSubscriptionAgreementAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_LongTermMarketableSecuritiesMember" abstract="true" name="LongTermMarketableSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodValueNonVotingCommonStockAcquisitions" abstract="false" name="StockIssuedDuringPeriodValueNonVotingCommonStockAcquisitions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ClassOfWarrantOrRightWarrantsVestedIntrinsicValue" abstract="false" name="ClassOfWarrantOrRightWarrantsVestedIntrinsicValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodSharesRestrictedNonVotingCommonStockAcquisitions" abstract="false" name="StockIssuedDuringPeriodSharesRestrictedNonVotingCommonStockAcquisitions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAllowableUnderThePlan" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAllowableUnderThePlan" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_StockRepurchaseProgramAdditionalAmountAuthorized" abstract="false" name="StockRepurchaseProgramAdditionalAmountAuthorized" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_ExchangeableStockSharesAuthorized" abstract="false" name="ExchangeableStockSharesAuthorized" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodSharesRestrictedNonVotingCommonStock" abstract="false" name="StockIssuedDuringPeriodSharesRestrictedNonVotingCommonStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_BusinessCombinationContingentConsiderationArrangementsFairValueAmount" abstract="false" name="BusinessCombinationContingentConsiderationArrangementsFairValueAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_LeaseModificationsReductionInRightOfUseAssetsAndCorrespondingOperatingLeaseLiabilities" abstract="false" name="LeaseModificationsReductionInRightOfUseAssetsAndCorrespondingOperatingLeaseLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cart_SaleOfStockAnniversaryTerm1" abstract="false" name="SaleOfStockAnniversaryTerm1" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cart_StockIssuedDuringPeriodSharesWarrantsExercised" abstract="false" name="StockIssuedDuringPeriodSharesWarrantsExercised" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_EquityAgreementsMember" abstract="true" name="EquityAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_TemporaryEquitySharesConversionOfConvertibleSecurities" abstract="false" name="TemporaryEquitySharesConversionOfConvertibleSecurities" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_CustomerBMember" abstract="true" name="CustomerBMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cart_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfShares" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNumberOfShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cart_SeriesARedeemableConvertiblePreferredStockMember" abstract="true" name="SeriesARedeemableConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
