Hi @cmapigon,
Please see the following technote for more information:
TN3174: Diagnosing issues with the Apple Pay payment sheet on your website
https://developer.apple.com/documentation/technotes/tn3174-diagnosing-issues-with-the-apple-pay-payment-sheet-on-your-website
If the issue is still unresolved after reading the information above, please follow the steps outlined in the post below:
Gathering Required Information for Troubleshooting Apple Pay on the Web Merchant Issues
https://developer.apple.com/forums/thread/762994
Once completed, please respond here with the Feedback ID so I can begin my investigation.
Cheers,
Paris X Pinkney | WWDR | DTS Engineer