How to add new invoice to payment using API

Jul 11, 2025 7:51AM

Summary:

Trying to setup a payment using API and then add related Invoices.

PaymentCreation
https://{{pod}}/fscmRestApi/resources/11.13.18.05/payablesPayments

This creates a payment using 1 invoice.

Then using below API for related invoice to add a new invoice -

https://{{pod}}/fscmRestApi/resources/11.13.18.05/payablesPayments/300000012586053/child/relatedInvoices

{"AmountPaidPaymentCurrency": 100,"CheckId": XXXX,"InstallmentNumber": 1,"InvoiceId": XXXXX,"InvoiceNumber":"TEST_INV_1","InvoicePaymentId": XXXXX}

Getting Below error

"You must provide a valid value for the Invoice Number attribute. (AP-810667)"
errorCode": "AP:::AP_RS_INVALID_VALUE"

Not sure what is wrong with invoice number. If using this invocie number in payment creation, payment getting creates successfully. Only receiving error when trying for related invoice.

How to add new invoice to payment using API

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