Application Programming Interfaces for Courier Services

A system and environment to enable entities to utilize courier services provided by a service provider are described herein. In some examples, the service provider exposes the courier services to a computing device associated with a merchant, buyer, and/or others using one or more Application Programming Interfaces (APIs) provided by the service provider. The one or more APIs may enable merchants and/or others to automatically integrate the courier services into technologies used by the merchants and/or others in order to facilitate delivery of items that are offered for acquisition by the merchants.