I have implemented a payment gateway for SwipeHQ's 1-off payment mechanism. It's similar to PayPal's mechanism in that there's an LPN that notifies CiviCRM of the success/failure of the transaction, and also a callback URL.
SwipeHQ adds a couple of URL parameters to the callback URL to notify of success/failure. These are in addition to the mechanisms in the LPN.
My issue is that the standard Thankyou page in Civi has no way of picking up this important info and using it to instruct the user to try again. The message there is "Thank you for your payment" or whatever is set up as the thank you message.
So what's the best/right way to handle this?
- is there a hook that could be used on the Thank you page to change the message?
- or might it be easiest to just override the Thank you php and tpl files in order to display appropriate messages? I'd rather that this could be integrated into the payment plugin rather than having to mess with overrides though.
- perhaps just some jQuery added to the page to do some dynamic HTML rewriting based on URL params?
- or as suggested in another question/answer, use the LPN trigger URL to give to the payment provider as the callback, and integrate the checking into that file. It would end with a redirect back to the thank you page on success.
The latter seems like a possibility, but may have some issues:
How would you handle HTML display in the case that it's not "success"? Just spit stuff out directly from the LPN? But this wouldn't have any other templating etc from the CMS. What other pages could be used to redirect to?
Thanks in advance for any advice.