Push_notification

def send_notification(registration_ids, message_title , message_desc):
    #* this is the API key
    fcm_api = "Your_API_KEY"

    url = "https://fcm.googleapis.com/fcm/send"

    headers = {
        "Content-Type": "application/json",
        "Authorization": 'key=' + fcm_api
    }

    payload = {
        "registration_ids": registration_ids,
        "priority": "high",
        "notification": {
            "body": message_desc,
            "title": message_title,
            "image": "https://i.ytimg.com/vi/m5WUPHRgdOA/hqdefault.jpg?sqp=-oaymwEXCOADEI4CSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLDwz-yjKEdwxvKjwMANGk5BedCOXQ",
            "icon": "https://yt3.ggpht.com/ytc/AKedOLSMvoy4DeAVkMSAuiuaBdIGKC7a5Ib75bKzKO3jHg=s900-c-k-c0x00ffffff-no-rj",

        }
    }

    result = requests.post(url,  data=json.dumps(payload), headers=headers)
    return result


####### in any views.py you can put the next lines to send notification for many users and don't forget to import sen_notification()method
        qs = CustomUser.objects.values('id').exclude(id=request.user.id)    # exclude user to send to himself
        users = [obj[0] for obj in qs]
            fcm_user = [
                (FCMDevice.objects
                    .values(
                        'registration_id'
                    ).filter(
                        user_id=obj
                    )
                ) for obj in users
            ]
            ## An error occurs by the next line when sending notification to any user
            ## that has no record in FCMDevice model SO YOU MUST MAKE ALL USERS HAVE A RECORD IN THIS TABLE
            ## TO AVOID ERROR
            reg_id = [obj[0] for obj in fcm_user]

            send_to_supplier = send_notification(
                reg_id, 'for all user New Order Created',
                str("Order Created Successfully ...")
            )