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The credentials to be used are the Boxalino account name and password provided on the project kick-off.
Helpful Links
Request https://github.com/boxalino/rtux-api-php/wiki/Request
Response https://github.com/boxalino/rtux-api-php/wiki/Response
Boxalino Intelligence Admin https://github.com/boxalino/rtux-api-php/wiki/Boxalino-Intelligence-Admin
Official Documentation Documentation