JUMP TOModern Treasury APIGetting StartedTopicsAuthenticationDevelopmentAPI Libraries & SDKsStatus CodesErrorsMetadataIdempotent RequestsRate LimitsPaginationTimestampsBanking FundamentalsSupported BanksACH Return/NOC CodesACH TimingsData Privacy ControlsData RetentionPaymentsPayment OrdersCreate Payment OrderpostExample RequestsAsync Create Payment OrderpostList Payment OrdersgetGet Payment OrdergetUpdate Payment OrderpatchLine ItemsList Line ItemsgetGet Line ItemgetUpdate Line ItempatchReturnsCreate ReturnpostList ReturnsgetGet ReturngetPaper ItemsList Paper ItemsgetGet Paper ItemgetList Paper Item DocumentsgetIncoming Payment DetailsList Incoming Payment DetailsgetGet Incoming Payment DetailgetUpdate Incoming Payment DetailpatchReversalsCreate ReversalpostGet ReversalgetList ReversalsgetPayment ReferencesGet Payment ReferencegetList Payment ReferencesgetCounterpartiesCounterpartiesCreate CounterpartypostExample RequestsList CounterpartiesgetGet CounterpartygetUpdate CounterpartypatchCollect Account DetailspostDelete CounterpartydeleteLegal EntitiesLegal EntitiesCreate Legal EntitypostUpdate Legal EntitypatchGet Legal EntitygetList Legal EntitiesgetExample RequestsIdentificationsLegal Entity AssociationsCreate Legal Entity AssociationpostConnection Legal EntitiesCreate Connection Legal EntitypostGet Connection Legal EntitygetList Connection Legal EntitiesgetBank AccountsInternal AccountsCreate Internal AccountpostList Internal AccountsgetGet Internal AccountgetUpdate Internal AccountpatchVirtual AccountsCreate Virtual AccountpostList Virtual AccountsgetGet Virtual AccountgetUpdate Virtual AccountpatchDelete Virtual AccountdeleteExternal AccountsCreate External AccountpostList External AccountsgetGet External AccountgetUpdate External AccountpatchDelete External AccountdeleteInitiate VerificationpostComplete VerificationpostRouting DetailsCreate Routing DetailpostList Routing DetailsgetGet Routing DetailgetDelete Routing DetaildeleteAccount DetailsCreate Account DetailpostList Account DetailsgetGet Account DetailgetDelete Account DetaildeleteContact DetailsCreate Contact DetailspostList Contact DetailsgetGet Contact DetailgetDelete Contact DetaildeleteBalance ReportsCreate Balance ReportpostList Balance ReportsgetGet Balance ReportgetBalancesConnectionsList ConnectionsgetForeign exchangeForeign Exchange RatesForeign Exchange QuotesCreate Foreign Exchange QuotepostExample RequestsList Foreign Exchange QuotesgetGet Foreign Exchange QuotegetReconciliationExpected PaymentsCreate Expected PaymentpostExample RequestsList Expected PaymentsgetGet Expected PaymentgetUpdate Expected PaymentpatchArchive Expected PaymentdeleteTransactionsCreate TransactionpostList TransactionsgetGet TransactiongetUpdate TransactionpatchDelete TransactiondeleteTransaction Line ItemsCreate Transaction Line ItemspostList Transaction Line ItemsgetDelete Transaction Line ItemsdeleteEntity LinksCreate Entity LinkpostDelete Entity LinkdeleteList Entity LinksgetLedgersLedgersCreate LedgerpostList LedgersgetGet LedgergetUpdate LedgerpatchDelete LedgerdeleteLedger AccountsCreate Ledger AccountpostList Ledger AccountsgetGet Ledger AccountgetUpdate Ledger AccountpatchDelete Ledger AccountdeleteLedger TransactionsCreate Ledger TransactionpostList Ledger TransactionsgetGet Ledger TransactiongetUpdate Ledger TransactionpatchList Ledger Transaction VersionsgetCreate Ledger Transaction ReversalpostCreate Ledger Transaction Partial PostpostLedger EntriesList Ledger EntriesgetGet Ledger EntrygetUpdate Ledger EntrypatchLedger Account CategoriesCreate Ledger Account CategorypostList Ledger Account CategoriesgetGet Ledger Account CategorygetUpdate Ledger Account CategorypatchDelete Ledger Account CategorydeleteAdd Ledger Account to CategoryputRemove Ledger Account from CategorydeleteAdd Ledger Account Category to CategoryputRemove Ledger Account Category from CategorydeleteLedger Account SettlementsCreate Ledger Account SettlementpostList Ledger Account SettlementsgetGet Ledger Account SettlementgetUpdate Ledger Account SettlementpatchAdd Ledger Entries to SettlementpatchRemove Ledger Entries from SettlementdeleteLedger Account StatementsCreate Ledger Account StatementpostGet Ledger Account StatementgetLedger Account Balance MonitorsCreate Ledger Account Balance MonitorpostList Ledger Account Balance MonitorsgetGet Ledger Account Balance MonitorgetUpdate Ledger Account Balance MonitorpatchDelete Ledger Account Balance MonitordeleteLedger BalancesBulk OperationsBulk RequestsCreate Bulk RequestpostGet Bulk RequestgetList Bulk RequestsgetBulk ResultsGet Bulk ResultgetList Bulk ResultsgetDevelopersAPI KeysCurrent API KeygetEventsList EventsgetGet EventgetWebhook EventsCreate Webhook EventpostGet Webhook EventgetWebhook EndpointsCreate Webhook EndpointpostList Webhook EndpointsgetGet Webhook EndpointgetUpdate Webhook EndpointpatchDelete Webhook EndpointdeleteWebhooksOverviewBalance Report WebhooksBulk Request WebhooksConnection Legal Entity WebhooksDecision WebhooksExpected Payment WebhooksExternal Account WebhooksIncoming Payment Detail WebhooksInvoice WebhooksLedger Account Balance Monitor WebhooksLedger Account Settlement WebhooksLedger Transaction WebhooksLegal Entity WebhooksPaper Item WebhooksPayment Order WebhooksPayment Reference WebhooksReturn WebhooksReversal WebhooksTransaction WebhooksUser Onboarding WebhooksVirtual Account WebhooksAdditional ResourcesAddressesDocumentsCreate DocumentpostList DocumentsgetGet DocumentgetDownload DocumentgetIP AddressesValidation EndpointsRouting NumbersValidate Routing NumbergetSimulation EndpointsIncoming Payment DetailSimulate Incoming Payment DetailpostInvoicesInvoicesCreate InvoicepostGet InvoicegetList InvoicesgetUpdate InvoicepatchAdd Payment Order to InvoiceputInvoice Line ItemsCreate Invoice Line ItempostGet InvoiceLineItemgetList Invoice Line ItemsgetUpdate Invoice Line ItempatchDelete Invoice Line ItemdeleteFlowsAccount Collection FlowsCreate Account Collection FlowpostList Account Collection FlowsgetGet Account Collection FlowgetUpdate Account Collection FlowpatchPayment FlowsCreate Payment FlowpostList Payment FlowsgetGet Payment FlowgetUpdate Payment FlowpatchModern Treasury JSOverviewInstallationInitializationDevice & Behavior Risk SDKEmbeddable FlowCreate Embeddable FlowMount Embeddable FlowUnmount Embeddable FlowCreate Routing Detailpost https://app.moderntreasury.com/api/external_accounts/{external_account_id}/routing_detailsCreate a routing detail for a single external account