Retrieves the full details of a single outbound payment. A payment that does not exist, is a draft, is deleted, is an internal (Ibanq-to-Ibanq) transfer or belongs to another client returns 404. amount carries amountInMinorUnits alongside the same figure as a decimal value, in the payment currency. fee has the same shape in its own currency and is only present for payments billed on demand. status is Sent once the bank has confirmed the payment — for some providers on their own message, before the end-of-day reconciliation; until then it is Processing. statusReason is populated when the payment is Returned or Cancelled and a reason was recorded; a Rejected payment carries none. fxTradeId is set when an FX trade funded the payment and can be fetched from /fx/trades/{id}. channel is how the payment was created: Portal, Api, or Brokered when an operator created it on the client's behalf.