APIkey authorization
API Feature Update 0.12.45 (20220607).
You may now pass an API key to the Authorization HTTP header.
New API parameter client_category
API Feature Update 0.12.19 (20220314).
Define the category of search by passing a string (full category name) to the new parameter client_category.
Event Objects and Error Codes
API Feature Update 0.12.13 (20220201).
Uniform event objects and error codes from all API routes and endpoints.
Sending session identifiers
API Feature Update 0.10.120 (20211130).
Session identifiers can be sent with every API call to identify end users in the form of a unique string.
