[Resolved] Cannot request access token - unsupported_grant_type

App Developers
1

Hello.
I am trying to go through authorization process when installing my data app.
I am following article Authorization
After i got “authorization_code” succesfully, i am sending request described in section 3 to request “access_token” via CURL request. However, does not matter what i do - i am always getting response following response:
{“error”:“unsupported_grant_type”}
My request body for POST to https://api.webflow.com/oauth/access_token:
array (size=4)
‘client_id’ => ‘— removed for security purpose —’
‘client_secret’ => ‘— removed for security purpose —’
‘code’ => ‘— removed for security purpose —’
‘grant_type’ => ‘authorization_code’

Those are variables from POST superglobal array - and looks like grant type set to correct value.
Please let me know what i am doin wrong way.
I also tried to send this request as POST request with parameters in url string - didnt work as well.
Thank you!
Regards, Max.

2

Issue solved. PHP was used to post fields using cURL, so postfields should be turned into query string instead of sending array as is:

curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array('postvar1' => 'value1')));