Is there a developer API for custom integrations?

The ReadyCloud API provides read and write access to orders, boxes, items, addresses and all the other major data stored and processed by ReadyCloud. It is a modern JSON based RESTful API.

Version 2.0 of the API is a major upgrade which provides many new properties and features, while at the same time simplifying and improving the format. Field naming is better, fewer fields are ‘custom fields’ but instead fully formatted and documented properties and we have a new way to distinguish explicit and implicit data.

You can view the developer API documentation here.