Отправьте сообщение с помощью Firebase Admin SDK

Если вы еще не настроили Firebase Admin SDK , следуйте руководству по настройке Firebase Admin SDK на своем сервере.

Включить API FCM HTTP v1

Включите API Cloud Messaging на странице настроек Cloud Messaging для вашего проекта.

Отправка сообщений на определенные устройства

Для отправки на одно конкретное устройство передайте токен регистрации устройства, как показано.

Node.js 

// This registration token comes from the client FCM SDKs.
const registrationToken = 'YOUR_REGISTRATION_TOKEN';

const message = {
  data: {
    score: '850',
    time: '2:45'
  },
  token: registrationToken
};

// Send a message to the device corresponding to the provided
// registration token.
getMessaging().send(message)
  .then((response) => {
    // Response is a message ID string.
    console.log('Successfully sent message:', response);
  })
  .catch((error) => {
    console.log('Error sending message:', error);
  });

Ява 

// This registration token comes from the client FCM SDKs.
String registrationToken = "YOUR_REGISTRATION_TOKEN";

// See documentation on defining a message payload.
Message message = Message.builder()
    .putData("score", "850")
    .putData("time", "2:45")
    .setToken(registrationToken)
    .build();

// Send a message to the device corresponding to the provided
// registration token.
String response = FirebaseMessaging.getInstance().send(message);
// Response is a message ID string.
System.out.println("Successfully sent message: " + response);
FirebaseMessagingSnippets.java

Питон 

# This registration token comes from the client FCM SDKs.
registration_token = 'YOUR_REGISTRATION_TOKEN'

# See documentation on defining a message payload.
message = messaging.Message(
    data={
        'score': '850',
        'time': '2:45',
    },
    token=registration_token,
)

# Send a message to the device corresponding to the provided
# registration token.
response = messaging.send(message)
# Response is a message ID string.
print('Successfully sent message:', response)
cloud_messaging.py

Идти 

// Obtain a messaging.Client from the App.
ctx := context.Background()
client, err := app.Messaging(ctx)
if err != nil {
	log.Fatalf("error getting Messaging client: %v\n", err)
}

// This registration token comes from the client FCM SDKs.
registrationToken := "YOUR_REGISTRATION_TOKEN"

// See documentation on defining a message payload.
message := &messaging.Message{
	Data: map[string]string{
		"score": "850",
		"time":  "2:45",
	},
	Token: registrationToken,
}

// Send a message to the device corresponding to the provided
// registration token.
response, err := client.Send(ctx, message)
if err != nil {
	log.Fatalln(err)
}
// Response is a message ID string.
fmt.Println("Successfully sent message:", response)
messaging.go

С# 

// This registration token comes from the client FCM SDKs.
var registrationToken = "YOUR_REGISTRATION_TOKEN";

// See documentation on defining a message payload.
var message = new Message()
{
    Data = new Dictionary<string, string>()
    {
        { "score", "850" },
        { "time", "2:45" },
    },
    Token = registrationToken,
};

// Send a message to the device corresponding to the provided
// registration token.
string response = await FirebaseMessaging.DefaultInstance.SendAsync(message);
// Response is a message ID string.
Console.WriteLine("Successfully sent message: " + response);

В случае успешного выполнения каждый метод отправки возвращает идентификатор сообщения. Firebase Admin SDK возвращает строку идентификатора в формате projects/{project_id}/messages/{message_id} .