Deprecated. Use POST /message_forward instead — that endpoint accepts the same arguments as a JSON body (with file content as base64) and additionally lets you override Swift Business Connect attributes (BIC, DN, service code, message type, sender reference) per message.

This endpoint will keep working for existing customers but will not receive new features. New swift_fin and swift_fileact bank services are only exposed via the new endpoint.

Forward a message that has been generated by your own system to your partner bank, CSM, or Swift network. The message is sent as is by Mambu Payments (formerly Numeral).