Hello hussam282,
Thank you for reaching out in Apple Support Communities. If we're understanding correctly, you're unable to complete a transaction on your iPhone by using Apple Pay. There are steps available to help troubleshoot Apple Pay. Our recommendation is to follow these steps:
- Please verify that you have a card added to the Wallet app for Apple Pay: Set up Apple Pay in Wallet on iPhone - Apple Support
2. Restart your iPhone and try to use Apple Pay again.
3. Verify that the latest version of iOS 16.3 is installed on your iPhone. You can go to Settings > General > Software Update.
4. You'll want to verify if the location you're attempting to make a purchase has a contactless payment symbol or the Apple Pay symbol. This will ensure that you can use Apple Pay with your iPhone.
5. Make sure that your holding the iPhone close to the terminal so it almost touches for the transaction.
Following these steps may help.
Kind regards.