ohShopify.php is a lightweight client that enables PHP applications to interact with the Shopify API. The client requires PHP version 4 with cURL support for its use. The client is compatible with OAuth Shopify Apps, and with valid authorization is able to access Shopify admin functionalities via Shopify API calls. This library is not officially supported by Shopify, but is endorsed on the Shopify API developer documentation list of 3rd party libraries. The package is maintained by Colin McDonald and is open sourced on GitHub.
Escrow.com has announced a beta version of its Platform API. Through the API, third party apps and services can integrate the escrow services Escrow.com has long been known for. Once integrated, apps and services can hold money in trust until a transaction has fully completed.
Printful, a drop shipping service for custom print products and a product of the same team who created Startup Vitamins and BeHappy.me, has provided the Printful API that will allow people to easily integrate the functionality with their websites and applications. The service is specifically aimed at small and medium websites that want to offer print products, but don't want to handle the fulfillment and shipping of those products.