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.
The Visa Developer Center Community Forum is for developer topics related to the Visa Developer Platform and its API products.
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 firstname.lastname@example.org so that we can help you further.