Many objects contain the ID of a related object in their response properties. For example, an Order may have an associated Message ID. Those objects can be included inline with the includes request parameter. Objects that can be included are noted in this documentation. This parameter is available on all API requests, and applies to the response of that request only.

You can nest include requests with the dot property. For example, requesting message.form_submission on an order will include the message property creating a full Message object, and will then include the form_submission property on that message creating a full Form Submission object.

You can include multiple objects at once by identifying multiple items in the includes comma separated string.