Teso_API/Teso API/Controllers/PaymentController.cs

using FirebaseAdmin.Messaging;
using Google.Apis.Auth.OAuth2;
using Google.Cloud.Firestore;
using Grpc.Auth;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Teso_API.Models;

namespace Teso_API.Controllers
{
    [AllowAnonymous, Route("payment")]
    [ApiController]
    public class PaymentController : ControllerBase
    {
        private readonly TESOContext _context;
        private FirestoreDb db;
        public PaymentController(TESOContext context)
        {
            _context = context;

           db = new FirestoreDbBuilder
            {
                ProjectId = ServerLocation.credentials.project_id,
                ChannelCredentials = GoogleCredential.FromJson(JsonConvert.SerializeObject(ServerLocation.credentials)).ToChannelCredentials(),
            }.Build();
        }
        [HttpGet("{filter}")]
        public async Task<ActionResult> Get(string orderID)
        {
            CoinPurchase purchase = await _context.CoinPurchases.AsQueryable().Where(o => o.OrderId == orderID).FirstOrDefaultAsync();
            if (purchase.Status == 1)
            {
                DocumentReference docRef = db.Collection(ServerLocation.user_notifications).Document(purchase.Customerid).Collection(purchase.Customerid).Document();
                Dictionary<string, object> user = new Dictionary<string, object>
                    {
                        { "notificationType", "coinpurchase" },
                        { "timestamp", new DateTimeOffset(DateTimeOffset.UtcNow.DateTime).ToUnixTimeMilliseconds()},
                        { "message", "You have successfully purchased "+ purchase.Coins + " silver coins which have been credit to your account"},
                        { "coinID", orderID },
                    };
                await docRef.SetAsync(user);

                string registrationToken = await _context.UserAuths.AsQueryable().Where(u => u.UserGUID == purchase.Customerid)
                    .Select(t => t.DeviceToken).FirstOrDefaultAsync();

                if (!String.IsNullOrEmpty(registrationToken))
                {
                    var message = new Message()
                    {
                        Token = registrationToken,
                        Data = new Dictionary<string, string>()
                        {
                        { "notificationType", "coinpurchase" },
                        { "timestamp", new DateTimeOffset(DateTimeOffset.UtcNow.DateTime).ToUnixTimeMilliseconds().ToString()},
                        { "message", "You have successfully purchased "+ purchase.Coins + " silver coins which have been credit to your account"},
                        { "orderID", orderID },
                        },
                        Notification = new Notification
                        {
                            Title = "Teso",
                            Body = "You have successfully purchased " + purchase.Coins + " silver coins which have been credit to your account"
                        },
                    };

                    var response = await FirebaseMessaging.DefaultInstance.SendAsync(message);
                }
            }
            else if (purchase.Status == 2 || purchase.Status == 3)
            {
                string registrationToken = await _context.UserAuths.AsQueryable().Where(u => u.UserGUID == purchase.Customerid)
                .Select(t => t.DeviceToken).FirstOrDefaultAsync();

                if (!String.IsNullOrEmpty(registrationToken))
                {
                    var message = new Message()
                    {
                        Token = registrationToken,
                        Data = new Dictionary<string, string>()
                        {
                        { "notificationType", "coinpurchase" },
                        { "timestamp", new DateTimeOffset(DateTimeOffset.UtcNow.DateTime).ToUnixTimeMilliseconds().ToString()},
                        { "message", "Your request to purchase "+ purchase.Coins + " Silver Coins failed"},
                        { "orderID", orderID },
                        },
                        Notification = new Notification
                        {
                            Title = "Teso",
                            Body = "Your request to purchase " + purchase.Coins + " failed"
                        },
                    };

                    var response = await FirebaseMessaging.DefaultInstance.SendAsync(message);
                }
            }
            return Ok();
        }
    }
}