User can rerun any existing transaction at any time which has been failed earlier. Authenticate this request using HTTP Basic Auth by adding a bearer token to the header, e.g. Authentication: Bearer {{access_token}}. You can get the {{access_token}} from the create token request.
If the previous transaction had the following values for transaction_type, SALE or PREAUTH, then both fields amountand transaction_uniqueare optional, if they are not entered, then it should use the amount and transaction_unique from the previous transaction.
If the previous transaction had “VERIFY” as transaction_type, then amount field is required.