ApplePay on website -validateMerchant-payment sheet stuck

I tried to integrate ApplePay on website. Followed the official documentation. Successfully creating the apple session. However according to my logs, execution doesn't even going to verify the merchant.

When I click the ApplePay button the payment sheet displays and it brings the card details, but the bottom button stays "Processing". May I know what could be the reason? Our PSP is credimax. Any input to resolve this is highly appreciate. we stuck on this for last 3 months.

The attached is the device payment sheet screen.

ApplePay on website -validateMerchant-payment sheet stuck
 
 
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