Thanks for the great plugin! I see that there is an easy way to direct customers to a URL once their payment is successful. However, I do not see a way to direct customers to a URL if the payment has failed.
When a payment does fail, I see that it adds "/?payment=failed" to the end of the current URL, but unfortunately WordPress doesn't allow pages to be created with "?" or "=" in the URL, so I can't simply make a new page with that URL in WordPress.
Any ideas? Thanks so much!