Send data to external websites when there is an update or create a post

Hi everyone,

I don’t know if it’s right to ask here.
But I think, I haven’t found the right one from the various topics that I got by searching from my question.

A brief description :
I have website A.
And want to send updates to website B when there is an update, delete or create a new post.

website B gave me:
url = https://api.domain.com/v2/bo/post/product-sync
basic auth = basicauth:password.

I created and added some code in function.php on my child theme.

Here’s my code snippet.

// Send update from Web A to Web B start HERE
// register new function
function get_course_prod_id($prod_id) {

    $course_args = array(
        'post_type' => 'courses',
        'meta_key' => '_tutor_course_product_id',
        'meta_value' => $prod_id
    );

    $course_loop = new WP_Query( $course_args ); 

    $coursereturnarray      = array();
    $mentorreturnarray      = array();
    $categoryreturnarray    = array();

    while ( $course_loop->have_posts() ) : $course_loop->the_post();
       
    $course_categories = get_tutor_course_categories();

    if(!empty($course_categories) && is_array($course_categories ) && count($course_categories)){
    
        $ind = 0;
    
        foreach ($course_categories as $course_category){
            $categoryreturnarray[]= $category_name['course_category'] = $course_category->name;
            $ind++;
        }
    }

    $coursereturnarray[] = array(
        'id'        => get_the_ID(),
        'name'      => get_the_title(),
        'url'       => get_the_permalink(),
        'mentor_id' => get_the_author_meta('id' , get_current_user_id()),
        'category'  => $categoryreturnarray
    );

    $mentorreturnarray[] = array(
     get_the_author_meta('id' , get_current_user_id())
     );
 
    endwhile;

    return array($coursereturnarray,$mentorreturnarray,$categoryreturnarray);

}

// register new action for trigger update,create, delete post data
function get_action($create_data,$update_at,$status) {
    
    $action = "";
    
    if($status == "trash") {
        $action = "delete";
    }else {
        
        if($create_data == $update_at) {
            $action = "create";
        }else {
            $action = "update";
        }
    }
    return $action;
}

// register data when send json
function unified_platform($parameter) {

    $per_page = $parameter['per_page'];

    $args = array(  
        'post_type'         => "product",
        'order'             => 'ASC',
        'post_status'       => array('publish', 'trash'),
        'posts_per_page'    => 200,
    );
    
    $loop = new WP_Query( $args ); 
    $datareturn = array();

    while ( $loop->have_posts() ) : $loop->the_post();
    $action = get_action(get_the_date('Y-m-d H:i:s'), get_the_modified_date('Y-m-d H:i:s'),get_post_status());

         $product_data = array(
           'platform'           => get_bloginfo(),
           'action'             => $action,
           'product_id'         => get_the_ID(),
           'product_name'       => get_the_title(),
           'product_slug'       => get_post_field('post_name', get_the_ID()),
           'product_permalink'  => get_the_permalink(),
           'product_url_image'  => wp_get_attachment_url(get_post_thumbnail_id(get_the_ID())),
           'price'              => get_post_meta( get_the_ID(), '_price', true),
           'regular_price'      => get_post_meta( get_the_ID(), '_regular_price', true),
           'status'             => get_post_status(),
           'stock_status'       => get_post_meta( get_the_ID(), '_stock_status', true),
           'stock_quantity'     => get_post_meta( get_the_ID(), '_stock', true),
           'total_sales'        => get_field('total_sales'),
         );

         $data = get_course_prod_id(get_the_ID());

         $courses = array('courses' => $data[0]);

         //$mentor = array('mentorIDs' => get_the_author_meta('id' , get_current_user_id()));
         //$mentor_user_login = get_the_author_meta('user_login' , get_current_user_id());
         $mentor = array('mentorIDs' => get_the_author_meta('user_login' , get_current_user_id()));

         $categories = array('categories' => $data[2]); 

         $published_date = array('published_at' => get_the_date('Y-m-d H:i:s'));
         
         $datareturn[] = array_merge($product_data,$courses,$mentor,$categories, $published_date);

    endwhile;

    wp_reset_query();
  if ( empty( $datareturn ) ) {
    return null;
  }
  return $datareturn;

//Then send from website A to B Here
  $url = 'https://api.domain.com/v2/bo/post/product-sync';
  $arguments = array (
      'method'          => 'POST',
      'body'            => $datareturn,
      'Authorization'   => 'Basic<basicauth:password>',
      'Content-Type'    => 'application/json'
  );

  $response = wp_get_post ( $url, $arguments );

  if ( is_wp_erro( $response ) ) {
      $error_message = $response->get_error_message();
      echo "Something When Wrong: $error_message";
  } else {
  echo 'Response:<pre>';
  print_r( $response );
  echo '</pre>';
  }
}

add_action( 'rest_api_init', function () {
  register_rest_route( 'unified', '/new-product/', array(
    'methods' => 'GET',
    'callback' => 'unified_platform',
  ) );

Is there something wrong with my code?
I really appreciate it and hope someone can help me here.

Thank you in advance ??