As a Channel Integrator you will receive a API Refresh Token. With such a Refresh Token you need to request an Access Token with a limited Lifetime (see POST /v1/auth). This Access Token must be provided as a Bearer Token in the Authorization Header with every request.
SessionId
Signup session retrieved
Signup-flow session payload referencing the JTL account that initiated the seller signup.
JTL Internal ID to identify a JTL Account
x >= 11782