was added firebase nitifying

Govor.Application/Interfaces/IConnectionStore.cs

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+namespace Govor.Application.Interfaces;
+
+public interface IConnectionStore
+{
+    void AddConnection(Guid userId, string connectionId);
+    void RemoveConnection(Guid userId, string connectionId);
+    IEnumerable<string> GetConnections(Guid userId);
+}

Govor.Application/Interfaces/IPrivateChatGroupManager.cs

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+using Govor.Core.Models;
+
+namespace Govor.Application.Interfaces;
+
+public interface IPrivateChatGroupManager
+{
+    Task AddUsersToPrivateChatGroupAsync(PrivateChat privateChat);
+    Task RemoveUsersFromPrivateChatGroupAsync(PrivateChat privateChat);
+}

Govor.Application/Interfaces/IUserPrivateChatsCreator.cs

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+using Govor.Core.Models;
+
+namespace Govor.Application.Interfaces;
+
+public interface IUserPrivateChatsCreator
+{
+    Task<PrivateChat> CreateAsync(Guid userIdA, Guid userIdB);
+}

Govor.Application/Interfaces/PushNotifications/IPushNotificationProvider.cs

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+using Govor.Application.Interfaces.PushNotifications.Models;
+
+namespace Govor.Application.Interfaces.PushNotifications;
+
+public interface IPushNotificationProvider
+{
+    string Name { get; }
+    
+    Task<SendPushResult> SendToTokenAsync(string token, PushMessage message);
+    
+    Task<SendPushResult> SendMulticastAsync(
+        IReadOnlyList<string> tokens,
+        PushMessage message);
+}

Govor.Application/Interfaces/PushNotifications/IPushNotificationService.cs

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+namespace Govor.Application.Interfaces.PushNotifications;
+
+public interface IPushNotificationService
+{
+    Task SendToUserAsync(Guid userId, string title, string body, string channelId, Dictionary<string, string>? data = null);
+
+    Task SendToUsersAsync(IEnumerable<Guid> userIds, string title, string body, string channelId, Dictionary<string, string>? data = null);
+    
+    Task SendToSessionAsync(Guid sessionId, string title, string body, string channelId, Dictionary<string, string>? data = null);
+}

Govor.Application/Interfaces/PushNotifications/Models/PushMessage.cs

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+namespace Govor.Application.Interfaces.PushNotifications.Models;
+
+public class PushMessage
+{
+    public string Title { get; set; } = string.Empty;
+    public string Body { get; set; } = string.Empty;
+    public Dictionary<string, string> Data { get; set; } = new();
+    public string? ChannelId { get; set; } = "chat_messages"; //for Android
+}

Govor.Application/Interfaces/PushNotifications/Models/SendPushResult.cs

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+namespace Govor.Application.Interfaces.PushNotifications.Models;
+
+public record SendPushResult(int SuccessCount, int FailureCount, IEnumerable<string> FailedTokens);