SmartShopper/express-server/push/push.js

var admin = require('firebase-admin');
  
function sendPush(msgtoken, title, text){
  
  
  var message = {
    notification: {
      title: title,
      body: text
    },
    token: msgtoken
  };
  
  admin.messaging().send(message)
  .then(function(response) {
    // See the MessagingDevicesResponse reference documentation for
    // the contents of response.
    console.log('Successfully sent message:', response);
  })
  .catch(function(error) {
    console.log('Error sending message:', error);
  });

}

function sendMultiplePush(message_ids, title, text){
  console.log(message_ids)
  var message = {
    data: {
      title: title,
      body: text
    },
    tokens: message_ids
  };
  
  admin.messaging().sendMulticast(message)
  .then(function(response) {
    // See the MessagingDevicesResponse reference documentation for
    // the contents of response.
    console.log('Successfully sent message:', response);
  })
  .catch(function(error) {
    console.log('Error sending message:', error);
  });
}
module.exports = {
    sendPush,sendMultiplePush
}