The authorizationResponse object allows to obtain authorization request details.
Only one attribute is returned in the response:
Return code of the authorization request sent by the issuing bank in case the authorization has been refused.
The possible values are listed in the chapter Managing authorization request return codes.
Here is a list of frequently returned codes that can help you understand the reason of the rejection:
0: Action successfully completed
2: Invalid attribute
10: Transaction not found
35: Payment token creation declined (transaction used to create the token must be successfully completed and authorized by the bank)
56: PAN not found ( PAN of the initial transaction not found)