All documentation about API is available here: https://confluence.e-loreal.com/display/APICOE/HIP+API+Section 

To access the API, your application must be first authorized on APIGEE: please send your authorization request to the API owner, by providing your application ID.

One authorized, your application must present a valid token for every API call. Here is the scope to specify to request for an access token for the "SKU UPDATE" API:

• DEV: api://2703cf84-3987-472e-9604-37f847fea6ac/.default
• QUAL: api://241d98ee-80bb-493e-8f9a-16b12737f479/.default
• SIMU: api://de9562dd-fb85-474c-8ab7-41539e9dff26/.default
• PROD: api://92ebccb6-4781-4e53-b463-063296554554/.default

Note that for ELIXPEDIA "SKU UPDATE" API, your application must also have the API permission "Product.SKU.Write" to be granted in Azure AD.
This API permission is served by these app:

• DEV => Elix_oAuth_Server_DEV (2703cf84-3987-472e-9604-37f847fea6ac)
• QUAL => Elix_oAuth_Server_QUAL (241d98ee-80bb-493e-8f9a-16b12737f479)
• SIMU => Elix_oAuth_Server_PPRD (de9562dd-fb85-474c-8ab7-41539e9dff26)
• PROD => Elix_oAuth_Server_PROD (92ebccb6-4781-4e53-b463-063296554554)