Etsy App OAuth

[Developer0889]

Hi everybody I managed to get past the message that the requested redirect url is not permitted by adding it to my app through the dashboard. But still I'm not being authenticated. I'm using the code from their Quick Start Tutorial. I'm being stuck here as I receive the oops message : 

// Extract the access token from the response access_token data field

if (response.ok) {

const tokenData = await response.json();

res.send(tokenData);

} else {

res.send("oops");

}

});

Can someone help me please.