message: JAAA: Your approval is required: Payment of 123 bytes from bg2 to FOQVPXOS6GXJASVDRQZALJMF5YBSSKUD initiated by MPG4MHVYUAP3B5IQX44LTINTSUKYB6JA(1), please send me back the pay_id linked to validate the transaction. And add a 'cancel = true' field to refuse it.