Merge multiple fcm Notification in ionic?

I have created an application in ionic. The application receives notification and is working well. However, when i send more notification to the application, it stacks up in the notification bar (Android).

I want to merge multiple notifications into one like whatsapp. Example

2 messages received from App

Here is my Code


  this.platform.ready().then(() => {
    // Okay, so the platform is ready and our plugins are available.
    // Here you can do any higher level native things you might need.
        .then((token: string) => {

            console.log("The token to use is: ", token);
        .catch(error => {


        (token: string) => console.log("Nuevo token", token),
        error => console.error(error)

        (data: NotificationData) => {
            if (data.wasTapped) {

                console.log("Received in background", JSON.stringify(data))
            } else {

                console.log("Received in foreground", JSON.stringify(data))
        }, error => {
            console.error("Error in notification", error)


Sending notification from PostMan

 "to": "ej-t7zm9yHw:APA91bFzLdt0DO7tHMMoANUxDHADZ65dd0ZQaBQZxjKOap6npsZkuG22t-xQDE7adRyTsp8qDpxExzXnLXO4DB5vAr4RY7_jQSdITx8K2JmwqVnxLOLawua5KAwfQcMfi_d xxxxxxxx",

    "notification": { "title": "testing stack notification ", "body":"is it working", "sound":"default", "icon":"icon",

"android": {               
                "data": {
                    "title": "testing stack notification",
                    "body": "is it working",
                    "style": "inbox",
                    "summaryText": "yes its %n% notifications",
                        "noteId": "123456"


"content":"Please Check Report"


Did you find any solutions for this problem ?