Follow up task for https://cr.smartling.net/cru/CR-PHP-CMS-MODULES-162#c37717 **DoD**: SDK is responsible for caching `access_token` and `refresh_token` and refresh them separately when required.
Follow up task for https://cr.smartling.net/cru/CR-PHP-CMS-MODULES-162#c37717
DoD: SDK is responsible for caching
access_tokenandrefresh_tokenand refresh them separately when required.