Re: "Buying a book at Apple books : I cannot buy a book. I have set up an Apple Pay in my wallet. "
Your Apple ID is the one account you use to access Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more. It includes the email address and password you use to sign in as well as the contact, payment, and security details you use across Apple services.
Only in some countries can Apple Pay be used for purchases from Apple:
Check which payment methods Apple can accept in your country or region:
Payment methods that you can use with your Apple ID - Apple Support
You may be able to add your Visa Card to your Apple ID account where it can be verified as a payment method.
How to add an Apple ID payment method:
Add a payment method to your Apple ID - Apple Support
How to delete an Apple ID payment method:
Remove a payment method from your Apple ID - Apple Support
How to change an Apple ID payment method:
If you need to change or update your Apple ID payment method - Apple Support
