A method for confirming post-authorization erasure of a transaction payment using reward points includes: storing account profiles including data related to reward accounts, each including an account identifier and point amount; receiving a transaction message associated with a payment transaction, the message including a specific account identifier and transaction amount; identifying a specific account profile that includes the specific account identifier; calculating a point cost based on the transaction amount; identifying an authorization reference key associated with the payment transaction and specific account profile; identifying a unique identifier associated with the authorization reference key; storing an authorization record including authorization reference key and unique identifier; generating a request message including the identified unique identifier one of: the point cost and transaction amount; and transmitting the request message to a consumer associated with the specific account profile.