Canceling a Transaction

A transaction can only be canceled if it is in the reserved state. If a payment has already been made, you cannot cancel the transaction; you can only refund the purchase price.

Process for Canceling a Transaction

On your web site, enable the sender to find the transaction to cancel.

Obtain from that transaction either the TransactionId, CallerReference, or both.

Submit a Cancel request using those values.

You could also review all the cancel requests from the buyers before requesting Amazon FPS to cancel the transaction. For more information about this action, see Cancel.

The following Cancel request cancels a transaction for a specified TransactionId.

https://fps.amazonaws.com/?
  Action=Cancel&
  AWSAccessKeyId=0656Example83G2&
  SignatureVersion=1&
  Timestamp=2007-08-06T13%3A00%3A01Z&
  TransactionId=254656Example83987&
  Version=2008-09-17&
  Signature=<URL-encoded signature value>