[5.3] Setup additional configuration for Slack Client.

src/Illuminate/Notifications/Channels/SlackWebhookChannel.php

@@ -59,12 +59,19 @@ protected function buildJsonPayload(SlackMessage $message)
             'channel' => data_get($message, 'channel'),
         ]);
 
-        return [
+        $payload = [
             'json' => array_merge([
                 'text' => $message->content,
                 'attachments' => $this->attachments($message),
             ], $optionalFields),
         ];
+
+        // Add other configuration settings if available.
+        if (! empty($message->options)) {
+            $payload = array_merge($payload, $message->options);
+        }
+
+        return $payload;
     }
 
     /**

src/Illuminate/Notifications/Messages/SlackMessage.php

@@ -48,6 +48,13 @@ class SlackMessage
      */
     public $attachments = [];
 
+    /**
+     * Additional settings for Slack HTTP Client.
+     *
+     * @var array
+     */
+    public $options = [];
+
     /**
      * Indicate that the notification gives information about a successful operation.
      *
@@ -145,4 +152,17 @@ public function color()
                 return '#F35A00';
         }
     }
+
+    /**
+     * Setup additional configuration for Slack HTTP Client.
+     *
+     * @param  array  $options
+     * @return $this
+     */
+    public function options($options)
+    {
+        $this->options = $options;
+
+        return $this;
+    }
 }