Make Payment

This endpoint extends the original make_payment API endpoint to allow asynchronous processing. Clients may optionally supply a wait parameter to have the server wait up to 30 seconds for a response from internal business systems. If a response has been received in that time, it is returned immediately. Otherwise status information and links are returned. Calling the status link returns the item response if available, status information otherwise. Clients may also optionally supply a callback URL in URL-encoded format. The path parameters {item}, {account} and {uuid} are supported. If a callback is present, the system POSTs the internal business system response to it.