I have been using realtime pricing api for around 3 months and today I bought api for historical data. Login process and all is already integrated but when I try to utilize this Historical Api which I just bought it gives me this error - "{"status":"error","message":"Incorrect `api_key` or `access_token`.","data":null,"error_type":"TokenException"}"
Are you sending api_key and access_token as header? You can check complete param here. Also, are you able to make call to other API end-points(quote, etc) using the same access_token?
Also, are you able to make call to other API end-points(quote, etc) using the same access_token?