Error "There was an issue setting up your call" when trying to obtain an access token

Question

I am encountering issues when trying to obtain an access token and refresh token. I retrieved the access code from the following URL: https://www.dropbox.com/oauth2/authorize?client_id=&redirect_uri=&token_access_type=offline&response_type=code I input the access code obtained from the above into and executed it: { 　"code": "", 　"grant_type": "authorization_code", 　"redirect_uri": "", 　"client_id": "", 　"client_secret": "" } However, I received the following error: There was an issue setting up your call. Raw response for the API Status code 400 {"error": "invalid_request", "error_description": "The request parameters do not match any of the supported authorization flows. Please refer to the API documentation for the correct parameters."} I am unsure of what needs to be corrected. Because this is not functioning correctly, I am unable to proceed with obtaining the refresh token. I would appreciate your advice.

Greg-DB · Accepted Answer

When you say you executed it, it sounds like you're referring to the step where you call /oauth2/token to exchange the authorization code for a refresh token and access token. It looks you're sending the parameters as JSON though, but the /oauth2/token endpoint requires application/x-www-form-urlencoded POST parameters, not JSON. Please update your code to send those parameters as application/x-www-form-urlencoded POST parameters. There's an example of this flow here that may be helpful.