I am currently stucked on making post requests to pinterest api. While I feel my code is working well, I keep getting back "Invalid Request Body" from the pinterest api.

Based on the documentation on their site, here is how they said the request should be made:

curl -X POST https://api.pinterest.com/v5/oauth/token --header "Authorization: Basic {base64 encoded string made of client_id:client_secret}" --header 'Content-Type: application/x-www-form-urlencoded' --data-urlencode 'grant_type=authorization_code' --data-urlencode 'code={YOUR_CODE}' --data-urlencode 'redirect_uri=http://localhost/'

Here is how I made the request using Axios from my ExpressJS application:

    const redirectUrl = process.env.PINTEREST_OAUTH_CALLBACK_URL;
    const clientId = process.env.PINTEREST_APP_ID;
    const clientSecret = process.env.PINTEREST_APP_SECRET;
    let url = 'https://api.pinterest.com/v5/oauth/token';
    let accessTokenRequestBody = {
        code: encodeURIComponent(code), //code is defined at the top as received from pinterest
        grant_type: encodeURIComponent("authorization_code"),
        redirect_uri: encodeURIComponent(redirectUrl)
    }
    console.log(`RequestBody =${JSON.stringify(accessTokenRequestBody, null, 2)}`);
    const clientIdAndSecretBase64 = Buffer.from(`${clientId}:${clientSecret}`).toString('base64');
    axios.post(url, accessTokenRequestBody, {
        headers: {
            'Content-Type': 'application/application/x-www-form-urlencoded; charset=UTF-8',
            'Authorization': `Basic ${clientIdAndSecretBase64}`
        }
    }).then((response) => {
        let responseData = response.data;
        console.log(`Pinterest ResponseData = ${JSON.stringify(responseData, null, 2)}`);
    }).catch((e) => {
        console.log(`${JSON.stringify(e.response.data)}`);
    });

Here is the response I keep getting back:

{code:1, message:"Invalid request body"}

Here is the link to the documentation I am working with

https://developers.pinterest.com/docs/api/v5/#tag/Authentication

Please, what could I be doing wrong here, because I believed I provided everything they needed in the request.

Thanks in anticipation for your input.