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The orders itself are based on the the international standard for exchanging orders in the book industry EDItX Trade Book Supply Order managed by Editeur. The XML standard is only used for the actual order documents, while the API is REST based on using JSON, where applicable the HAL standard is used to format JSON messages and provide standard interfaces for linking, paging and other interactions.
Authentication against the API follows the same standard as for all Bokbasen APIs, see Authentication Service for details.