Reiner Lee

the token comes from the mobile devices, you have to install the firebase SDK and get it from there. then send it to backend for future notification purpose.

For Icon: https://documentation.onesignal.com/docs/customize-notification-icons For Image: https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages * checkout on the image column, you should pass in the public accessible URL.