PayPal Adaptive producing error Response ack is Failur - angularjs

Question

app.post('/api/pay_for_palns_credit_card', function(req, res) {
console.log(req.body);
db = req.db;
var email = 'admin#qhop.com';
var amount = req.body.amount;
var firstname = req.body.firstname;
var lastname = req.body.lastname;
var cardtype = req.body.cardtype;
var cardnumber = req.body.cardnumber;
var expiremonth = req.body.expiremonth;
var expireyear = req.body.expireyear;
var cvv = req.body.cvv;
var payer = req.body.email;
var collection = db.get('paymentscollections');
var Paypal = require('paypal-adaptive');
var paypalSdk = new Paypal({
userId: 'id',
password: 'password',
signature: 'signatures',
sandbox: true //defaults to false
});
var payload = {
requestEnvelope: {
errorLanguage: 'en_US'
},
actionType: 'PAY',
currencyCode: 'USD',
feesPayer: payer,
memo: 'this is a test',
cancelUrl: 'http://test.com/cancel',
returnUrl: 'http://test.com/success',
receiverList: {
receiver: [{
email: email,
amount: amount,
primary: 'false'
}]
}
};
paypalSdk.pay(payload, function(err, response) {
console.log(payload);
if (err) {
console.log('in here');
console.log(err);
res.send(err);
} else {
collection.insert({
payload
}, function(err, doc) {
if (err) {
console.log(err);
// If it failed, return error
res.send(err);
} else {
console.log(doc);
res.send(doc);
}
});
}
});
});
I am getting the following error while using paypaladaptive.
These are all the details I have of error.
Error: Response ack is Failure. Check the response for more info.
at IncomingMessage. (D:\Qhoppaypal1\node_modules\paypal-adaptive\