You can register your eligible Card(s) with Amex Pay by logging into the Amex Mobile App and navigating to the Amex Pay feature. After clicking ‘Register’ you will be taken through the setup flow and you will need to follow the below steps to complete your registration:
1) Provide required location and phone permissions
2) Select the channel for receiving a one-time verification code
3) Enter the verification code
Once the verification code has been validated, you will see a confirmation screen indicating that your Card has been registered with Amex Pay. You will also receive an email confirming your registration.