Issue Generating Refresh Token with OAuth Code Flow

ImpulseWebDev

Hello, I have been struggling a bit with getting a refresh token or any success response at all from the endpoint 'https://api.dropboxapi.com/oauth2/token' when following the guide here https://developers.dropbox.com/oauth-guide.

While the docs show all curl requests, I am attempting to make my request currently from postman, but in the end I would like to do this via a standard fetch request if possible.

However, when making requests to the endpoint above, I always am returned the response

{
    "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."
}

Here is one example of my request:

   var details = {
    'code': 'REDACTED',
    'grant_type': 'authorization_code',
    'REDACTED': 'REDACTED'
  };

  var formBody = [];
  for (var property in details) {
    var encodedKey = encodeURIComponent(property);
    var encodedValue = encodeURIComponent(details[property]);
    formBody.push(encodedKey + "=" + encodedValue);
  }
  formBody = formBody.join("&");

  fetch('https://api.dropboxapi.com/oauth2/token', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8'
    },
    body: formBody
  }).then(function(response) { 
    return response.json()
  }).then(function(data) {   
    console.log(data);
  })

Here is my postman version


For the sections covered in red or 'REDACTED':
The code I am getting via this URL https://www.dropbox.com/oauth2/authorize?client_id=REDACTED&response_type=code&token_access_type=offline

The lowest section is my app key and app secret (in that order).

Is it possible to make this POST request to this endpoint in the way I am trying?

If so, is it possible to see an example somewhere in the docs that is not a curl request? // or point me in the direction of what I am not doing correctly by chance?

Edit: I should also note that this account has purchased 'Teams'.
Thanks in advance!

Greg-DB

Given your redactions and descriptions, it seems like you're sending a parameter with the name being your app key and the value being your app secret, however that is not the correct formatting. When calling /oauth2/token to exchange the authorization code for an access token/refresh token with the code flow like this, you should send a parameter named "client_id" with the value being your app key, and a parameter named "client_secret" with the value being your app secret. You would do that the same way you already have a parameter named "code" with the value being the authorization code string.

 

(Note that it's also possible to send the app key and secret as "Basic" authorization, which is what the example in the documentation does using the "-u" curl flag, but that would be encoded and formatted differently. I recommend just using the parameters as described above for simplicity.)