Add purchase item

This operation has been deprecated and will be removed in the future!
Reason: Purchase items have been replaced by new line items.
This operation is replaced by https://docs.nitrobox.io/reference/addlineitem.
Deprecated since: 2023-03-01

Sunset at the latest: 2024-02-29

Please refer to our "API Lifecycle Management" and our "API Migration Guide" to find out more.

DEPRECATED: Use the line items endpoints instead. A request to add new purchase items to an existing order.
Language
Authorization
OAuth2