New method on DiscordClient.

DiscordClient/Data/ChannelMessagesResponse.cs

@@ -0,0 +1,3 @@
+namespace DiscordClient.Data;
+
+public class ChannelMessagesResponse { }

DiscordClient/DiscordClient.cs

@@ -1,5 +1,29 @@
-namespace DiscordClient;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using DiscordClient.Data;
+
+namespace DiscordClient;
 
 public class DiscordClient
 {
+    private readonly HttpClient _httpClient;
+
+    public DiscordClient(string authorizationToken)
+    {
+        _httpClient = new HttpClient();
+        _httpClient.DefaultRequestHeaders.Host = "discord.com";
+        _httpClient.DefaultRequestHeaders.Authorization = AuthenticationHeaderValue.Parse(
+            authorizationToken
+        );
+    }
+
+    public async Task<ChannelMessagesResponse[]?> GetChannelMessages(
+        string channelId,
+        int limit = 50
+    )
+    {
+        string url = $"https://discord.com/api/v9/channels/{channelId}/messages?limit={limit}";
+        HttpResponseMessage response = await _httpClient.GetAsync(url);
+        return await response.Content.ReadFromJsonAsync<ChannelMessagesResponse[]>();
+    }
 }