@User Thank you for quick reply! I've looked through the code of nodejs-sdk and supertokens-core, and still can't say usage of idRefreshToken became clear to me (the purpose of idRefreshTokenHeader is unclear too). But I'll look closer to the client sdks as well, and maybe I will ask more specific questions. If there are any sequence diagrams with usage of idSessionToken (cookie and header) in documentation it will be very helpfull. Thanks.