Hi rdd7755,
Welcome to the Apple Support Communities!
We are happy to help with the issue you are having with wanting to add your virtual card in your Wallet as a payment method for Amazon. The debit card you have set up in Wallet can be used for Apple Pay. The full card details are not available from Wallet for your security. "With your iPhone or Apple Watch, you can use Apple Pay in stores, restaurants, gas stations, taxis, or wherever else you see one of these symbols." Take a look at Make purchases using Apple Pay and Learn where to use Apple Pay.
You would need your actual debit card to add it as a payment method with third parties like Amazon.
Cheers!