I got an issue for reject code 400 for Apple Pay transactions, the details of the reject code it´s not detailed one, maybe somebody have a the same situation. The issue it´s for both cellphone or watch.
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If you are having issues with an Apple Pay payment, please contact Apple.
If I am mistaken and you are attempting to integrate with Apple Pay via a Visa API product, please send an inquiry to email@example.com so that we can help you further.