I’m wondering if it is possible to implement the followings:
Get the form content forwarded to a 3rd party lead validation vendor (to check against stop file) and based on SUCCESS or FAIL feedback, present two possible thank you page for the visitor. One says Thank you, your order is accepted and another with some Sorry, something went wrong etc. message.
The vendor expects something like this delivered to their system
After validation the vendor do the following: A successful lead will generate the response SUCCESS. If some data is wrong or do not pass the validation procedures, the server will respond FAIL followed by a brief description of the error. The response values will be passed as plain text in capital letters in the response from the server.