I followed the instructions for hosting the Apple Pay file publicly in our domain. All instructions here were followed. Testing this with an Apple device that has Apple Pay enabled, we get this error message. We have done this twice, each time using the link in the FAQ to get the most up-to-date file.
Any suggestions? The embedded form is here. Do the steps need to be done in exact order? For example, Blackbaud checkout was enabled and the form was embedded already prior to completing steps of placing the Apple Pay file in our domain.
Where have we gone wrong?