The Printful Ruby SDK by Printful permits API communication to implement printing features into application. Printful offers personalized solutions with additional APIs, including product catalog, orders, and store information.
Adding shipping and posting functionalities to your applications may be necessary for your what you're trying to achieve, but it may not always be a quick and easy process. EasyPost is a posting and shipping service specifically designed for applications, saving developers some very valuable development time. The EasyPost API makes it possible for developers to access this functionality and easily integrate it with other applications.
DropBuddies, the Postmates of Nigeria, launched an API that allows local businesses to include courier services directly within their apps. Without leaving the integrated business' app, users get a delivery quote, ETA, and book a delivery. Once booked, users can track shipments through delivery.