JSON Web Token
The JWT (JSON Web Token) must be signed using the HMAC-SHA256 ("HS256") algorithm. The signing key for the token is the jwt_secret parameter, which you will receive along with the other integration parameters from the support service.
More information about JWT can be found on jwt.io. There, you will also find links to libraries for working with JWT.
It is important to note that the JWT token should be generated on the server-side, not on the client-side, to avoid secret leakage.