Custom cancelation / cancelled hook

Hi All
I am using s2members pro forms with authorize.net. I have a cancel page with the short code which all works correctly however the cancel button when completed only changes a small piece of text via ajax. Is there a js/php hook so that I can redirect to “goodbye page” or do something more obvious?

Thanks

Wayne

The authorize.net hooks and filters are all listed here: https://www.s2member.com/codex/stable/s2member/authnet/package-filters/