Get a custom field price value for a custom post type in Woocommerce

I am using the following code to use custom post type's custom field to use as a price field. So that I can add this field value in cart and make the payment.

Good news is that this custom post is successfully going into cart but the problem is that price value is Wrong.

Price should be $400 but it is displaying $51,376.

Here is the code:

if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
// Put your plugin code here

add_action('woocommerce_loaded' , function (){
    //Put your code here that needs any woocommerce class
    //You can also Instantiate your main plugin file here
    class WCCPT_Product_Data_Store_CPT extends WC_Product_Data_Store_CPT
    {

        /**
         * Method to read a product from the database.
         * @param WC_Product
         */

        public function read(&$product)
        {

            $product->set_defaults();

            if (!$product->get_id() || !($post_object = get_post($product->get_id())) || !in_array($post_object->post_type, array('refered_customer', 'product'))) { // change birds with your post type
                throw new Exception(__('Invalid product.', 'woocommerce'));
            }

            $id = $product->get_id();

            $product->set_props(array(
                'name' => $post_object->post_title,
                'slug' => $post_object->post_name,
                'date_created' => 0 < $post_object->post_date_gmt ? wc_string_to_timestamp($post_object->post_date_gmt) : null,
                'date_modified' => 0 < $post_object->post_modified_gmt ? wc_string_to_timestamp($post_object->post_modified_gmt) : null,
                'status' => $post_object->post_status,
                'description' => $post_object->post_content,
                'short_description' => $post_object->post_excerpt,
                'parent_id' => $post_object->post_parent,
                'menu_order' => $post_object->menu_order,
                'reviews_allowed' => 'open' === $post_object->comment_status,
            ));

            $this->read_attributes($product);
            $this->read_downloads($product);
            $this->read_visibility($product);
            $this->read_product_data($product);
            $this->read_extra_data($product);
            $product->set_object_read(true);
        }

        /**
         * Get the product type based on product ID.
         *
         * @since 3.0.0
         * @param int $product_id
         * @return bool|string
         */
        public function get_product_type($product_id)
        {

            $post_type = get_post_type($product_id);
            if ('product_variation' === $post_type) {
                return 'variation';
            } elseif (in_array($post_type, array('refered_customer', 'product'))) { // change birds with your post type
                return false;
            } else {
                return false;
            }
        }
    }
});

}

add_filter( 'woocommerce_data_stores', 'woocommerce_data_stores' );

function woocommerce_data_stores ( $stores ) {

$stores['product'] = 'WCCPT_Product_Data_Store_CPT';

return $stores;

}

add_filter('woocommerce_product_get_price', 'woocommerce_product_get_price', 10, 2 );

function woocommerce_product_get_price( $invoice_price, $product ) {

if ($post->post->post_type === 'refered_customer') // change birds with your post type

    $invoice_price = get_post_meta($post->id, "invoice_price", true);

return $invoice_price;

}

Updated - In your last hooked function to get the right price, you have some errors:

• $post->post->post_type will not work as the $post object is not defined.
• $post->id should be $post->ID, but it will not work as the $post object is not defined.

Instead you will use dedicated functions and methods: get_post_type() and $product->get_id().

So try this:

add_filter('woocommerce_product_get_price', 'woocommerce_product_get_price', 10, 2 );
function woocommerce_product_get_price( $price, $product ) {
    // Change birds with your post type
    if ( get_post_type( $product->get_id() ) === 'refered_customer' )
        $price = get_post_meta( $product->get_id(), "invoice_price", true );

    return $price;
}

Code goes in function.php file of your active child theme (or active theme). It should works now.