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  <xs:element id="iiiv_OtherBusinessCombinationsMember" abstract="true" name="OtherBusinessCombinationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_BusinessCombinationRecognizedLiabilityAssumedAccruedExpensesAndOtherCurrentLiabilities" abstract="false" name="BusinessCombinationRecognizedLiabilityAssumedAccruedExpensesAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_NonCompeteAgreementsAndOtherIntangibleAssetsMember" abstract="true" name="NonCompeteAgreementsAndOtherIntangibleAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour" abstract="false" name="FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_RevolvingCreditLines2023SeniorSecuredCreditFacilityMember" abstract="true" name="RevolvingCreditLines2023SeniorSecuredCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_OneTwoThreeOrSixMonthSOFRMember" abstract="true" name="OneTwoThreeOrSixMonthSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_AdjustedTermSOFRMember" abstract="true" name="AdjustedTermSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_SOFRPlus1Member" abstract="true" name="SOFRPlus1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_LineOfCreditOptionalAdditionToBorrowingCapacity" abstract="false" name="LineOfCreditOptionalAdditionToBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_LineOfCreditFacilityConsolidationBasis" abstract="false" name="LineOfCreditFacilityConsolidationBasis" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iiiv_DebtCovenantMinimumConsolidatedInterestCoverageRatio" abstract="false" name="DebtCovenantMinimumConsolidatedInterestCoverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iiiv_DebtCovenantMaximumTotalLeverageRatio" abstract="false" name="DebtCovenantMaximumTotalLeverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iiiv_DebtInstrumentCovenantCommitmentFeeMultiplier" abstract="false" name="DebtInstrumentCovenantCommitmentFeeMultiplier" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_DebtInstrumentLeverageRatioAxis" abstract="true" name="DebtInstrumentLeverageRatioAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="iiiv_DebtInstrumentLeverageRatioDomain" abstract="true" name="DebtInstrumentLeverageRatioDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_DebtInstrumentLeverageRatioOneMember" abstract="true" name="DebtInstrumentLeverageRatioOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_DebtInstrumentLeverageRatioTwoMember" abstract="true" name="DebtInstrumentLeverageRatioTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_DebtInstrumentLeverageRatioThreeMember" abstract="true" name="DebtInstrumentLeverageRatioThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_DebtInstrumentLeverageRatioFourMember" abstract="true" name="DebtInstrumentLeverageRatioFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_DebtInstrumentCovenantNetLeverageRatio" abstract="false" name="DebtInstrumentCovenantNetLeverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iiiv_LineOfCreditFacilityLetterOfCreditFeePercentage" abstract="false" name="LineOfCreditFacilityLetterOfCreditFeePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="iiiv_August2024ShareRepurchaseProgramMember" abstract="true" name="August2024ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_May2026ShareRepurchaseProgramMember" abstract="true" name="May2026ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_February2026ShareRepurchaseProgramMember" abstract="true" name="February2026ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_August2025ShareRepurchaseProgramMember" abstract="true" name="August2025ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_TreasuryStockValueAcquiredIncludingRelatedCostsCostMethod" abstract="false" name="TreasuryStockValueAcquiredIncludingRelatedCostsCostMethod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_ShareRepurchaseProgramExciseTaxAndCommissions" abstract="false" name="ShareRepurchaseProgramExciseTaxAndCommissions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_ContinuingEquityOwnersMember" abstract="true" name="ContinuingEquityOwnersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_TaxReceivableAgreementPercentOfTaxBenefitsPayableToContinuingEquityOwners" abstract="false" name="TaxReceivableAgreementPercentOfTaxBenefitsPayableToContinuingEquityOwners" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="iiiv_TaxReceivableAgreementPercentOfTaxBenefitsRetained" abstract="false" name="TaxReceivableAgreementPercentOfTaxBenefitsRetained" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="iiiv_TaxBenefitDueToRelatedParties" abstract="false" name="TaxBenefitDueToRelatedParties" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_ExpectedPaymentsForRepurchaseOfRedeemableNoncontrollingInterest" abstract="false" name="ExpectedPaymentsForRepurchaseOfRedeemableNoncontrollingInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_PeriodOfPaymentToContinuingEquityOwners" abstract="false" name="PeriodOfPaymentToContinuingEquityOwners" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="iiiv_DisposalGroupIncludingDiscontinuedOperationAccruedContingentConsiderationLongTermAssetsHeldForSale" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationAccruedContingentConsiderationLongTermAssetsHeldForSale" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndCancelledInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndCancelledInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="iiiv_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndCancelledWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndCancelledWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="iiiv_PurchaseObligationToBePaidAfterYearFour" abstract="false" name="PurchaseObligationToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_SSVsStateMember" abstract="true" name="SSVsStateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_SSVsSheriffsMember" abstract="true" name="SSVsSheriffsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_SoftwareServicesLLCMember" abstract="true" name="SoftwareServicesLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_I3VerticalsLLCMember" abstract="true" name="I3VerticalsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_NumberOfDaysVolumeWeightedAveragePrice" abstract="false" name="NumberOfDaysVolumeWeightedAveragePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="iiiv_RecapitalizationExchangeRatio" abstract="false" name="RecapitalizationExchangeRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iiiv_ReverseRecapitalizationSharesRetired" abstract="false" name="ReverseRecapitalizationSharesRetired" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="iiiv_SubsidiaryOwnershipIncreasePercentageParent" abstract="false" name="SubsidiaryOwnershipIncreasePercentageParent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="iiiv_EquityMethodInvestmentOwnershipPercentageDecrease" abstract="false" name="EquityMethodInvestmentOwnershipPercentageDecrease" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="iiiv_ReportableSegmentMember" abstract="true" name="ReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_TechnologyCostAndExpenseOperating" abstract="false" name="TechnologyCostAndExpenseOperating" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_NoncontrollingInterestCommonUnitOwnershipByParent" abstract="false" name="NoncontrollingInterestCommonUnitOwnershipByParent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="iiiv_NoncontrollingInterestIncreaseFromRecapitalizationOfContribution" abstract="false" name="NoncontrollingInterestIncreaseFromRecapitalizationOfContribution" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_NoncontrollingInterestIncreaseDecreaseFromAllocationOfEquity" abstract="false" name="NoncontrollingInterestIncreaseDecreaseFromAllocationOfEquity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_NetIncomeLossAttributableToNoncontrollingInterestAfterTransfersToFromNoncontrollingInterests" abstract="false" name="NetIncomeLossAttributableToNoncontrollingInterestAfterTransfersToFromNoncontrollingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iiiv_OutoftheMoneyStockOptionsMember" abstract="true" name="OutoftheMoneyStockOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iiiv_EmployeeStockOptionsAndRestrictedStockUnitsRSUsMember" abstract="true" name="EmployeeStockOptionsAndRestrictedStockUnitsRSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="iiiv_DenominatorBasicAbstract" abstract="true" name="DenominatorBasicAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="iiiv_NumeratorDilutedAbstract" abstract="true" name="NumeratorDilutedAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="iiiv_DenominatorDilutedAbstract" abstract="true" name="DenominatorDilutedAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="iiiv_NewShareRepurchaseProgramMember" abstract="true" name="NewShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
