JSON-request

    // makeRequest when data-Obj is transformed to string with JSON.stringify(data)
    // We need to append: contentType: 'application/json'
    function makeRequest(method, module, endpoint, auth) {
        return {
            url: BASE_URL + module + '/' + APP_KEY + '/' + endpoint,
            method: method,
            headers: {
                'Authorization': makeAuth(auth)
            },
            contentType: 'application/json'
        }
    }

    // post function when data-Obj is transformed to string with JSON.stringify(data)
    function post(module, endpoint, auth, data) {
        let obj = makeRequest('POST', module, endpoint, auth);

        if (data) {
            obj.data = JSON.stringify(data);
        }
        return $.ajax(obj);
    }