Initial commit

PcgsInvUi/Services/CoinCollection.cs

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+using System.Collections.Generic;
+using PcgsInvUi.Models;
+
+namespace PcgsInvUi.Services;
+
+public class CoinCollection
+{
+    public IEnumerable<Coin> GetItems() => new[]
+    {
+        new Coin(),
+        new Coin(),
+        new Coin(),
+    };
+}

PcgsInvUi/Services/Database.cs

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+namespace PcgsInvUi.Services;
+
+public class Database
+{
+    // TODO Create a database using SQLite.
+}

PcgsInvUi/Services/PcgsClient.cs

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+using System;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using PcgsInvUi.Models;
+
+namespace PcgsInvUi.Services;
+
+public class PcgsClient
+{
+    private string _apiUri = "https://api.pcgs.com/publicapi";
+    private readonly string _apiKey;
+
+    public PcgsClient(string apiKey)
+    {
+        _apiKey = apiKey;
+    }
+
+    public async Task<Coin> GetCoinFactsByGrade(int pcgsNumber, int grade, bool plusGrade)
+    {
+        Coin newCoin = null;
+        using (HttpClient client = new HttpClient())
+        {
+            string requestUri =
+                $"{_apiUri}/coindetail/GetCoinFactsByGrade/?PCGSNo={pcgsNumber}&GradeNo={grade}&PlusGrade={plusGrade}";
+            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", _apiKey);
+            HttpResponseMessage response = await client.GetAsync(requestUri);
+
+            if (response.IsSuccessStatusCode)
+            {
+                string jsonResponse = await response.Content.ReadAsStringAsync();
+                newCoin = ParseJsonResponse(jsonResponse);
+            }
+            else
+            {
+                Console.WriteLine($"Error: {response.StatusCode} - {response.ReasonPhrase}");
+            }
+        }
+
+        return newCoin;
+    }
+        
+    // TODO Will eventually create the other methods that are included in the Public API.
+
+    private Coin ParseJsonResponse(string json)
+    {
+        Coin newCoin = JsonConvert.DeserializeObject<Coin>(json);
+        return newCoin;
+    }
+}