Example of using sending mail with PostageApp using fermata in node.js

postageApp.js

var fermata = require('fermata'),
    uuid = require('node-uuid');

var apiKey = 'YOUR_API_KEY'; // should probably be imported from an external keys file

var site = fermata.api({url: 'https://api.postageapp.com/v.1.0'});

exports.send = function (details, cb) {
    site['send_message.json'].post(details, cb);
};

exports.sendBetaInvite = function (inviteCode, email, cb) {
    exports.send({ 
        api_key: apiKey,
        uid: uuid(),
        'arguments': {
            recipients: [email],
            template : "invitation",
            variables: {invitecode: inviteCode}
        }
    }, cb);
};

useit.js

var postageApp = require('./postageApp');  // assuming they're in the same directory

postageApp.sendBetaInvite('code', 'my@email.com', function (err, result) {
    console.log('the result is', result); // outputs data returned
});