var Sendy = require('sendy-api'),
    sendy = new Sendy('http://your_sendy_installation/', 'your_api_key');

var params = {
    email: '[email protected]',
    list_id: 'your_list_id'
}

sendy.subscribe(params, function(err, result) {
    if (err) console.log(err.toString());
    else console.log('Subscribed succesfully');
});

var params = {
    email: '[email protected]',
    list_id: 'your_list_id'
}

sendy.unsubscribe(params, function(err, result) {
    if (err) console.log(err.toString());
    else console.log('Unsubscribed succesfully);
});

var params = {
    email: '[email protected]',
    list_id: 'your_list_id'
}

sendy.status(params, function(err, result) {
    if (err) console.log(err.toString());
    else console.log('Status: ' + result);
});

var params = {
    list_id: 'your_list_id'
}

sendy.countActive(params, function(err, result) {
    if (err) console.log(err.toString());
    else console.log('Active subscribers: ' + result);
});

var params = {
    from_name: 'Your name',
    from_email: '[email protected]',
    reply_to: '[email protected]',
    subject: 'Your Subject',
    plain_text: 'Campaign text'  // Optional.
    html_text: '<h1>Campaign text</h1>',
    send_campaign: 0 // Set to 0 if you just want to create a draft campaign — 1 if you want to create and send.
    list_ids: 'your_list_id' // seperate multiple lists with a comma. Only required if send_campaign parameter is true.
    brand_id: 'your_brand_id' // only required if send_campaign parameter is false. Check url what is, i=X that x is the brand ID.
};

sendy.createCampaign(params, function(err,result){
    if (err) console.log(err.toString());
    else console.log(result);
});