"unsupported_grant_type" when requesting access token

[Nn Kk]

There are a few posts about this but I couldn't find one with an answer. API docs say to use the "authorization_code" grant_type, but I get a response saying that it is an unsupported type.

"{ ["Unauthorized"]=> string(0) "" } array(1) { ["error"]=> string(22) "unsupported_grant_type" }"

$params["grant_type"]     = "authorization_code";
$params["code"]           = {auth code from previous step}

$params["redirect_uri"]   = {endpoint for app}

$auth = base64_encode("$application_id:$shared_secret");

curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER,
                                                array('Content-type: application/x-www-form-urlencoded',
                                                      "Authorization: Basic $auth",
                                                      ));
curl_setopt($curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $content);

[[ChannelAdvisor] Marshall McClure]

Hi,

Unfortunately, it is a known issue that the REST API occasionally returns an "unsupported_grant_type" error for requests that should have been successful. Assuming your request is valid, trying again should work.

Regards,

M

[Nn Kk]

Thanks for the response. I've tried this call multiple times, with a few different authentication codes - since they're only valid for the first 5 minutes. I've also tried turning curl verify-host/peer off. All calls yield the same response.

[[ChannelAdvisor] Marshall McClure]

In that case, it is likely that your request is incorrect somehow. Please either submit a support case at https://community.channeladvisor.com/s/support-center or email sup...@channeladvisor.com so our support team can provide assistance.

Regards,

M

[Joe C.]

Did you ever find out what the problem was? following the documentation exactly with the examples yields the same issue for me. 

[Joseph Cooper]

I found the issue was Channel Advisor, I created a new application, updated the client ID and secret, worked first time. 

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