Possible reasons for Apple Pay registration error
Possible reasons for Apple Pay registration error are the following:
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Site without SSL. Make sure that all websites that signed up for Apple Pay have SSL enabled and are accessible without errors over https://.
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The site host differs from the data in the system. For example, the website is registered as https://example.com, but the website URL is https://www.example.com, and https://example.com redirects to https://www.example.com. Thus, Apple cannot download the verification file.