Yandex.Checkout processes the received request immediately. If the request can't be processed within a few seconds, the server returns the processing response (status=1). In this case, the merchant should repeat the request with the same data to get a final response.
The recommended interval for repeating the request is once after one minute, three more times with 5 minute intervals, then waiting at least 30 minutes between further attempts.
If the createInvoice request with payment via Sberbank Online (invoiceType=sberbank) continues getting the status=1 response after one hour, the payment is considered unsuccessful.