Add tag_subscribers method

src/ConvertKit_API_Traits.php

@@ -602,6 +602,43 @@ public function update_tag_name(int $tag_id, string $name)
         return $this->put(sprintf('tags/%s', $tag_id), ['name' => $name]);
     }
 
+    /**
+     * Tags the given subscribers with the given existing Tags.
+     *
+     * @param array<int,array<string>> $taggings     Taggings, in the format:
+     *   [
+     *    [
+     *      "tag_id" => 0,
+     *      "subscriber_id" => 0
+     *    ],
+     *    [
+     *      "tag_id" => 1,
+     *      "subscriber_id" => 1
+     *    ],
+     *   ].
+     * @param string                   $callback_url URL to notify for large batch size when async processing complete.
+     *
+     * @since 2.2.1
+     *
+     * @see https://developers.kit.com/api-reference/tags/bulk-tag-subscribers
+     *
+     * @return false|mixed
+     */
+    public function tag_subscribers(array $taggings, string $callback_url = '')
+    {
+        // Build parameters.
+        $options = ['taggings' => $taggings];
+        if (!empty($callback_url)) {
+            $options['callback_url'] = $callback_url;
+        }
+
+        // Send request.
+        return $this->post(
+            'bulk/tags/subscribers',
+            $options
+        );
+    }
+
     /**
      * Tags a subscriber with the given existing Tag.
      *