C# OAUTH2 TD Ameritrade POST

Question

User-2004102533 posted

I used the TD Ameritrade POST site to successfully get an access token. When I later put the same values in C# I get an invalid_grant response. What can cause that?

Here is the C# code

string url = string.Format("https://api.tdameritrade.com/v1/oauth2/token");
            RestClient client = new RestClient(url);
            RestRequest postRequest = new RestRequest(Method.POST);
            postRequest.AddHeader("cache-control", "no-cache");
            postRequest.AddHeader("content-type", "application/x-www-form-urlencoded");
            postRequest.AddParameter("application/x-www-form-urlencoded", "grant_type=authorization_code&access_type=offline&code= pMAPaM9nHYPUurvRxtnJXCINMAYP/1xDvZVEePiUFJYtsSldm88bVLxgf/f90XH653eEw8BbzE468HlZtgP4ph8igtGCFsTnyc/Z+N+CT/E=212FD3x19z9sWBHDJACbC00B75E&client_id=[e-mail]&redirect_uri=http://localhost", ParameterType.RequestBody);
            IRestResponse response = client.Execute(postRequest); 

Answer 1

User1724605321 posted

Hi DoctorWhoKnew,

Check the response , do you find any inner detail error message returned from server ? You are using authorization_ code code flow , please also confirm that you have set correct code which returned from the previous code request .

Best Regards,

Nan Yu 

Answer 2

User-2004102533 posted

I removed the access_type = offline. That was giving me a new refresh token each time.