Add the WebhookSettings.GetSignedEventWebhookPublicKeyAsync method

Resolves #329

Source/StrongGrid.IntegrationTests/Tests/WebhookSettings.cs

@@ -14,11 +14,15 @@ public async Task RunAsync(IBaseClient client, TextWriter log, CancellationToken
 
 			// GET THE EVENT SETTINGS
 			var eventWebhookSettings = await client.WebhookSettings.GetEventWebhookSettingsAsync(null, cancellationToken).ConfigureAwait(false);
-			await log.WriteLineAsync("The event webhooks settings have been retrieved.").ConfigureAwait(false);
+			await log.WriteLineAsync("The event webhook settings have been retrieved.").ConfigureAwait(false);
 
 			// GET THE INBOUND PARSE SETTINGS
 			var inboundParseWebhookSettings = await client.WebhookSettings.GetAllInboundParseWebhookSettingsAsync(null, cancellationToken).ConfigureAwait(false);
-			await log.WriteLineAsync("The inbound parse webhooks settings have been retrieved.").ConfigureAwait(false);
+			await log.WriteLineAsync("The inbound parse webhook settings have been retrieved.").ConfigureAwait(false);
+
+			// GET THE SIGNED EVENTS PUBLIC KEY
+			var publicKey = await client.WebhookSettings.GetSignedEventsPublicKeyAsync(cancellationToken).ConfigureAwait(false);
+			await log.WriteLineAsync($"The signed events public key is: {publicKey}").ConfigureAwait(false);
 		}
 	}
 }

Source/StrongGrid/Resources/IWebhookSettings.cs

@@ -133,5 +133,14 @@ Task<EventWebhookSettings> UpdateEventWebhookSettingsAsync(
 		/// The async task.
 		/// </returns>
 		Task DeleteInboundParseWebhookSettingsAsync(string hostname, string onBehalfOf = null, CancellationToken cancellationToken = default);
+
+		/// <summary>
+		/// Get the signed events public key.
+		/// </summary>
+		/// <param name="cancellationToken">The cancellation token.</param>
+		/// <returns>
+		/// The public key.
+		/// </returns>
+		Task<string> GetSignedEventsPublicKeyAsync(CancellationToken cancellationToken = default);
 	}
 }

Source/StrongGrid/Resources/WebhookSettings.cs

@@ -234,6 +234,21 @@ public Task DeleteInboundParseWebhookSettingsAsync(string hostname, string onBeh
 				.AsMessage();
 		}
 
+		/// <summary>
+		/// Get the signed event webhook public key.
+		/// </summary>
+		/// <param name="cancellationToken">The cancellation token.</param>
+		/// <returns>
+		/// The public key.
+		/// </returns>
+		public Task<string> GetSignedEventWebhookPublicKeyAsync(CancellationToken cancellationToken = default)
+		{
+			return _client
+				.GetAsync($"{_eventWebhookEndpoint}/settings/signed")
+				.WithCancellationToken(cancellationToken)
+				.AsSendGridObject<string>("public_key");
+		}
+
 		private static JObject CreateJObject(string hostname, Parameter<string> url, Parameter<bool> spamCheck, Parameter<bool> sendRaw)
 		{
 			var result = new JObject