Basic flow:-

1. Call GetBillers (M) : To get all billers
2. Call GetBillerPaymentItems (M) : To gets the items attached to a particular biller.
3. Call SendBillPaymentAdvice (M) : To get send request to ISW for processing.
4. Call CustomerValidation (M) : For items that requires validation. E.g. Disco, LCC etc.
5. QueryTransaction (M): To get the status of a specific transaction.

NOTE: Kindly ensure the QueryTransaction request is made no earlier than 360secs after Send BillPayment Advice / DoTransfer response has been received or the timeout period has elapsed. Also, ensure your request timeout is set to a minimum of 60secs for Send BillPayment Advice / DoTransfer calls.