For Product Authentication or Original Check
[product_authentication]
Authentication or Validation is to check if the product is geniune and its serial number exists in database. That will be useful if you want your customers to check the originality of product they bought.
But for warranty, You will need to use registration shortcode where customers can register their products after purchase. So they can easily claim the warranty when they need. You can instruct your customers in your package how they can register the product for warranty claim in future.
For product registration you can use this shortcode.
[product_registration]
So this is how it can work.
1. Customer purchase product from Amazon, product include in package a QR code for warranty registration which you can generate online
2. Customer visit the registration url on your website enter their informationa nd product serial number to register.
3. Registration is complete and in future if they claim warranty you can check if their warranty is registered or not from WP backend registrations page.