Definition of done:
Making the cancel border less obvious and make the text red
Create new error message per mockup below in comments
Original body (old information)
When in the Checkout page of the donation flow, after you select the Credit Card type and the iframe loads, user testing sessions show that people click the CANCEL button at the bottom of the iframe expecting the interface to allow them to change card types, however, they are redirected to an error page, cancelling their donation.
Is this expected behavior?
Current behavior: Redirect donors to an error page and cancel their donation.
Suggested behavior: Nothing. Remove the CANCEL button altogether.