WORK IN PROGRESS Explains Adverts Forms API

wpadverts-custom-fields-api.php

<?php
/**
 * Plugin Name: [Adverts] Custom Fields API
 * Version: 1.0
 * Author: Greg Winiarski
 * Description: This plugin explains how to create custom fields for Add Advert form.
 */

add_filter( "adverts_form_load", "my_adverts_form_load" );

function my_adverts_form_load( $form ) {
    if( $form["name"] != "advert" ) {
        return $form;
    }
    
    // remove Price field
    foreach($form["field"] as $k => $v) {
        if($v["name"] == "adverts_price") {
            unset($form["field"][$k]);
        }
    }
    
    // add new custom field
    $form["field"][] = array(            
        "name" => "my_custom_field",
        "type" => "adverts_field_text",
        "order" => 25,
        "label" => "Custom Field",
        "is_required" => true,
        "validator" => array( 
            array( "name" => "is_required" ),
        )
    );
    
    return $form;
}

add_action( "adverts_tpl_single_details", "my_adverts_tpl_single_details" );

// display custom field value in the frontend
function my_adverts_tpl_single_details( $post_id ) {
    $cf = get_post_meta( $post_id, "my_custom_field", true);
    
    if( empty( $cf ) ) {
        return;
    }
    
    ?>
    
    <div class="adverts-grid-row">
        <div class="adverts-grid-col adverts-col-30">
            <span class="adverts-round-icon adverts-icon-wordpress"></span>
            <span class="adverts-row-title">Custom Field</span>
        </div>
        <div class="adverts-grid-col adverts-col-65">
            <?php esc_html_e( $cf ) ?>
        </div>
    </div>
    
    <?php
}

do you have a completed version