I'm a new with php and I am working on a WordPress project where I need to create a custom REST API endpoint that allows publishing posts with specific permalinks. Here's what I'm trying to achieve: Create a new REST API endpoint, something like /wp-json/custom/post This endpoint should accept POST requests with the following parameters: title: The title of the post content: The content of the post custom_permalink: The specific permalink I want to use for this post The endpoint should create a new post with the provided title and content, and set its permalink to the specified custom permalink It should return a success message with the post ID if the creation is successful, or an error message if it fails The main reason I need this custom solution is that the standard slug parameter in the WordPress REST API doesn't support forward slashes (/) and automatically converts them to hyphens (-). For example: If I set slug to ndd/test/test2, WordPress converts it to ndd/test-test2 What I actually want is to keep the structure as ndd/test/test2 I don't understand why this isn't possible natively in WordPress for posts, which is why I'm seeking a custom solution. I've tried using the register_rest_route() function to create the endpoint, but I'm not sure how to properly set up the rewrite rules to allow for these custom permalinks. Here's a basic structure I've started with: add_action('rest_api_init', function () { register_rest_route('custom/v1', '/post', array( 'methods' => 'POST', 'callback' => 'create_custom_post_callback', 'permission_callback' => function() { return current_user_can('publish_posts'); } )); }); function create_custom_post_callback($request) { $title = $request->get_param('title'); $content = $request->get_param('content'); $custom_permalink = $request->get_param('custom_permalink'); // Create post $post_id = wp_insert_post(array( 'post_title' => $title, 'post_content' => $content, 'post_status' => 'publish', )); if (is_wp_error($post_id)) { return new WP_Error('failed-to-create', 'Failed to create post', array('status' => 500)); } // How do I set the custom permalink here? // What rewrite rules do I need to modify? return new WP_REST_Response(array('post_id' => $post_id), 200); } My main questions are: What rewrite rules do I need to modify to allow for these custom permalinks with multiple levels (e.g., ndd/test/test2)? How can I set the custom permalink for the newly created post within the callback function, preserving the desired structure? Are there any security considerations I should keep in mind when implementing this, especially considering the ability to create arbitrary URL structures? Is there a way to achieve this using WordPress's native functionality that I might be overlooking? Thank you in advance for your help!