[REST API] DELETE /invoices/payments/{id} still missing in v22/v23 — previous issues closed without fix

[bauj]

Feature Request

This is a follow-up to #7838 and #10066 (closed with no resolution). The problem has not been fixed as of v22.0.4 and v23.0.x.

Problem

The REST API allows creating a payment via POST /invoices/{id}/payments, but there is no way to delete one. The DELETE /invoices/payments/{id} endpoint does not exist — calling it returns "API not found
(failed to include API file)".

This makes it impossible to manage the full invoice lifecycle via the REST API alone. Concretely:

• A paid invoice cannot be deleted (returns 403 "not erasable") even after settounpaid + settodraft, because the llx_paiement_facture record is still present
• The only workaround is a direct SQL DELETE FROM llx_paiement_facture — which defeats the purpose of having a REST API

Requested endpoint

DELETE /invoices/payments/{id}

Where {id} is the payment ID from llx_paiement. This already exists as a UI action (action=deletepayment&paiement_id=X on compta/facture/card.php) — it just needs to be exposed in the API.

References

• Issue REST API cannot create/update/delete payments ? #7838 — closed with no resolution
• Issue REST API cannot create/update/delete payments #10066 — closed as stale, never fixed

[DATUC]

I encountered a similar issue when deleting a TakePos invoice. After deleting the payment and adding the following rules:
INVOICE_CAN_BE_EDITED_EVEN_IF_PAYMENT_DONE
INVOICE_CAN_ALWAYS_BE_EDITED
INVOICE_CAN_ALWAYS_BE_REMOVED
I was unable to delete the invoice.