Call /GenerateAuthorizeToken endpoint to get an authorize token. This token will be active for 30 minutes. If it's not used within 30 minutes, it will expired and will become invalid. If it's expired, you will need to generate a new authorize token.
The /GenerateAuthorizeToken endpoint must be called using POST method, must contain a request header parameter named flinks-auth-key and its value has to be the secret key (see Step 1).