Thanks for help.
Another question. It seems I need an AppKey, to access GCAPI as explained here: "The AppKey required to use the GCAPI is sent to you once you have returned the signed terms and conditions of the GCAPI to our Partnerships team"
Do I need to do this for the Demo Trading system? Where can I find the terms and conditions of the GCAPI? What's contact details for the Partnerships team?
I tried to login, this is the response I received:
"ErrorMessage": "Sorry, your login has failed|This is because your login credentials do not match our records.",