The Tesco PHP library by Laurence Roberts contains search for products, get customer's basket, get all product categories, and get all current offers. Tesco API is about e-commerce, food, and grocery accessibility for desktop and mobile applications. The most recent update according to Tesco site is that as of today, developers can register for the refreshed Tesco Labs API.
PayOnDelivery, online payment platform that doesn't charge until delivery, has announced the PayOnDelivery API. Third party apps and websites may use the API to integrate payment processing. Developers have full access to the PayOnDelivery platform, including its keystone feature that refuses to release funds until the product lands in a consumer's hands.