Subscribe to Mailchimp fro Azure Mobile Service

gistfile1.js

var execute = function (method, availableParams, givenParams, callback) {
    var request = require('request');
    var finalParams = { apikey: 'XXXXXXXX' };
    var currentParam;

    for (var i = 0; i < availableParams.length; i++) {
        currentParam = availableParams[i];
        if (typeof givenParams[currentParam] !== 'undefined')
            finalParams[currentParam] = givenParams[currentParam];
    }

    request({
        uri: 'https://us6.api.mailchimp.com/1.3/?method=' + method,
        method: 'POST',
        headers: { 'User-Agent': 'azure' },
        body: JSON.stringify(finalParams)
    }, function (error, response, body) {
        }
    });

}
function addToMailChimp(item) {
    try {
        execute('listSubscribe', [
        	    'id',
        	    'email_address',
        	    'merge_vars',
        	    'email_type',
        	    'double_optin',
        	    'update_existing',
        	    'replace_interests',
        	    'send_welcome',
        ], { id: 'XXXXX', email_address: item.email }, function () {

        });
    } catch (ex) {
        console.log(ex);
    }
}