You must call Verify Authorization in cases when plan authorization and order closure do not happen simultaneously. An example of this would be when a customer checks out with a Payment Form or Flex Form, or is redirected for 3DS. To call it, you need to provide the plan number you received in the success response from Initiate.
Unauthorized Request: Token is not authorized or is expired
Resource Does Not Exist: Plan or service does not exist; for all APIs, if an invalid plan number is passed in the URL, this error will be returned
General Server Error: Server encountered an unexpected condition
General Error: Sorry. There has been an error. Please try again.