You should not poll a payment provider in a general flow. Do you realize how many requests that will cause if everybody did that? A payment flow is event-driven

You should not poll a payment provider in a general flow. Do you realize how many requests that will cause if everybody did that? A payment flow is event-driven by nature. The payment provider pushes the states back to the initiating system. If that fails it is up to the consumer to detect problems and make sure that the system is in sync with the provider. Some payment providers do push data up to at least 24h. It is an obvious design flaw...