The Shopify Checkout API allows you to purchase products from a Shopify store programmatically. A checkout in Shopify is the object used to manage a customer’s cart as it transitions to a paid checkout. Some features include calculating taxes, shipping rates, attaching the customer’s information, and finally completing a purchase by submitting a payment. Shopify provides services for merchants, that want to sell online, in-store, or anywhere. It is ecommerce solutions, such as, integrating your service into the Shopify admin, customizing any website, and more.