You are working as a security expert in an e-commerce enterp…

You are working as a security expert in an e-commerce enterprise. Your company recently decided on a short-term collaboration with a small business named BuyMe, and the following issue arose. Whenever your customers purchase any product from BuyMe, the e-commerce website redirects them to the BuyMe website, asking for additional authentication. This results in customers abandoning their purchases. To solve this issue, both enterprises agree to use a single authentication process wherein the users, once logged in to your website, can purchase from BuyMe without additional steps.How should you implement this without storing the customers’ credentials on the BuyMe server?