createClient.js

//This is what our endpoint does when it receives a POST request from our app to create a client
//axios is the library we use to make HTTP calls
//We are running this on a Firebase Cloud Function

var response = await axios.post('https://api.mindbodyonline.com/public/v6/usertoken/issue', {
        "Username": "Siteowner",
        "Password": "apitest1234"
    }, {
        headers: {
            'Content-Type': 'application/json',
            'Api-Key': mindBodyApiKey,
            'SiteId': '-99'
        }
    })
    console.log(response.data);
    var accessToken = response.data.AccessToken;

    try {
        var addClientResponse = await axios({
            method: 'POST',
            url: 'https://api.mindbodyonline.com/public/v6/client/addclient',
            body: req.body,
            headers: {
                'Content-Type': 'application/json',
                'SiteId': '-99',
                'Api-Key': mindBodyApiKey,
                'Authorization': 'Bearer ' + accessToken,
            }
        })
        console.log(addClientResponse.data);
        res.send('post client')
    } catch (err) {
        console.log('da error', err.response.data);
        res.send(err.response.data);
    }