Post rankmath title tag and meta description using WP REST API?

Please give an example based on the code i provided.

Look here: https://imgur.com/a/uyK6Du8
Im writing in python. And i try to add the meta data, and i am able to create the post, but the title tag and description are not added when i run the code.

Please help me out here. Here is my latest development on this issue…

I want to be able to specify the Rank math title tag and rank math meta description when I publish wordpress posts using the WP REST API. I have followed your article (https://badlywired.com/2018/01/getting-post-meta-via-wordpress-rest-api/) and created my own plugin (see code below). And then, I have also tried to publish a post using python, using the code further below. However, it doesn’t work somehow. According to you guys, the meta field is named “rank_math_title”, but when i type that into my script, i get an error

“Failed to create post. Status Code: 403
Response: {“code”:”rest_cannot_update”,”message”:”Sorry, you are not allowed to edit the _rank_math_title custom field.”,”data”:{“key”:”_rank_math_title”,”status”:403}}”

When i type “_rank_math_title” into the plugin, and “rank_math_title” in the POST call (python script), i can publish a post, but it has not inserted the title tag into the rank math field, when i look up in the wp admin editor… This is really confusing to be honest.

Plugin code:

<?php
/**
 * Plugin Name:       Rest API Custom Meta Field
 * Plugin URI:        https://website.com/
 * Description:       Register post meta field
 * Version:           1.0
 * Author:            X
 * Author URI:        https://website.com/
 *
 */
if ( ! defined( 'WPINC' ) ) {
	die;
}
add_action( 'rest_api_init', 'register_posts_meta_field' );

function register_posts_meta_field() {
    $object_type = 'post';
    $title_tag = array( // Validate and sanitize the meta value.
        // Note: currently (4.7) one of 'string', 'boolean', 'integer',
        // 'number' must be used as 'type'. The default is 'string'.
        'type'         => 'string',
        // Shown in the schema for the meta key.
        'description'  => 'A meta key associated with a string meta value.',
        // Return a single value of the type.
        'single'       => true,
        // Show in the WP REST API response. Default: false.
        'show_in_rest' => true,
    );
    register_meta( $object_type, '_rank_math_title', $title_tag );
}

Python script:

import requests
def create_post(username, password, base_url, title, slug, status, categories, title_tag):
    post_data = {
        "title": title,
        "slug": slug,
        "status": status,
        "categories": categories,
        "meta": {
            "rank_math_title": title_tag,
        }
    }

    try:
        # Send the HTTP request
        url = f"{base_url}posts"
        response = requests.post(url, auth=(username, password), json=post_data)
        
        # Check the response
        if response.status_code == 201:
            print('Post created successfully')
            print('Post ID:', response.json().get('id'))
        else:
            print('Failed to create post. Status Code:', response.status_code)
            print('Response:', response.text)
    except requests.exceptions.RequestException as e:
        print('An error occurred while making the request:', str(e))

create_post("XXXX", "XXX", "https://website.com/wp-json/wp/v2/", "hej", "hej", "draft", "13", "THIS IS A TITLE TAG")