add-gift-card-custom-product-type.php

<?php
/*
Plugin Name: Add Gift Card as Custom Product Type
Description: A simple demo plugin on how to add Gift Card as your custom product type
Author: Bhavik Kiri
Version: 1.0
*/

add_action( 'plugins_loaded', 'wcpt_register_gift_card_type' );

function wcpt_register_gift_card_type () {
	// declare the product class
    class WC_Product_Gift_Card extends WC_Product {
        public function __construct( $product ) {
           $this->product_type = 'gift_card';
           parent::__construct( $product );
           // add additional functions here
        }
    }
}

add_filter( 'product_type_selector', 'wcpt_add_gift_card_type' );

function wcpt_add_gift_card_type ( $type ) {

	// Key should be exactly the same as in the class product_type
	$type[ 'gift_card' ] = __( 'Gift Card' );
	
	return $type;
}

add_filter( 'woocommerce_product_data_tabs', 'gift_card_tab' );

function gift_card_tab( $tabs) {
	
	$tabs['gift_card'] = array(
		'label'	 => __( 'Gift Card', 'wcpt' ),
		'target' => 'gift_card_options',
		'class'  => ('show_if_gift_card'),
	);

	return $tabs;
}

add_action( 'woocommerce_product_data_panels', 'wcpt_gift_card_options_product_tab_content' );

function wcpt_gift_card_options_product_tab_content() {

	// Dont forget to change the id in the div with your target of your product tab
	?><div id='gift_card_options' class='panel woocommerce_options_panel'><?php

		?><div class='options_group'><?php

			woocommerce_wp_checkbox( array(
				'id' 	=> '_enable_gift_card',
				'label' => __( 'Enable Gift Card Product', 'wcpt' ),
			) );

			woocommerce_wp_text_input( array(
				'id'          => '_gift_card_price',
				'label'       => __( 'Price', 'wcpt' ),
		       		'placeholder' => '',
		       		'desc_tip'    => 'true',
		       		'description' => __( 'Enter Gift Card Price.', 'wcpt' ),
		       ));
		?></div>
	</div><?php
}

add_action( 'woocommerce_process_product_meta', 'save_gift_card_options_field' );

function save_gift_card_options_field( $post_id ) {

	$enable_gift_card = isset( $_POST['_enable_gift_card'] ) ? 'yes' : 'no';
	update_post_meta( $post_id, '_enable_gift_card', $enable_gift_card );

	if ( isset( $_POST['_gift_card_price'] ) ) :
		update_post_meta( $post_id, '_gift_card_price', sanitize_text_field( $_POST['_gift_card_price'] ) );
	endif;
}

add_action( 'woocommerce_single_product_summary', 'gift_card_template', 60 );

function gift_card_template () {

	global $product;
	if ( 'gift_card' == $product->get_type() ) {

		$template_path = plugin_dir_path( __FILE__ ) . 'templates/';
		// Load the template
		wc_get_template( 'single-product/add-to-cart/gift_card.php',
			'',
			'',
			trailingslashit( $template_path ) );
	}
}