ServerlessCronFunctionExampleStripe.js

exports.transferHandler = function transferHandler(event, context) {

  context.callbackWaitsForEmptyEventLoop = false;
  const time = new Date();
  const current_time_unix = moment().unix();
  connectToDatabase()
  .then(() => {
    BookingModel
        .find({})
        .then((bookings) => {
            bookings.forEach((booking, index) => {
                const booking_time_unix = moment(booking.bookingDate).unix();
                if (booking.isAccepted && (booking_time_unix < current_time_unix) && (booking.refundID === "" && booking.transferID === "")) {
                    UserModel
                        .findOne({_id: booking.bookedAccountId})
                        .then((user) => {
                            let amount = booking.total;
                            if (booking.fee)
                                amount = booking.fee;

                            stripe.transfers.create({
                                amount: Math.round((amount - (amount * 0.029 + 0.2) ) - (amount - (amount * 0.029 + 0.2)) * 0.05) * 100,
                                currency: "usd",
                                source_transaction: booking.chargeID,
                                destination: user.accountServices.stripe.stripe_user_id,
                            }).then(function(transfer) {
                                // asynchronously called
                                console.log(`[:Payment Transferr]Successfully transfered "${amount} USD" to "${user.basicInformation.firstname}"(Booked Supplier Account), the transfer ID is "${transfer.id}"`);
                                booking.transferID = transfer.id;
                                booking.save((u_err, u_booking) => {
                                    if (u_err)
                                        console.log(u_err);
                                });
                            });
                        })
                        .catch((err) => {
                            console.log(err);
                        });
                }
                else
                    console.log("[:Payment Transferr] There is no booking for transfer.");
            });
        })
        .catch((err) => {
            console.log(err);
        });
    })
    .catch((err) => {
      console.log("MongoDB connection error. Please make sure MongoDb is running.", err);
      process.exit();
    });

    console.log(`Your cron function "${context.functionName}" ran at ${time}`);
};