Add a free product after check a checkbox at checkout level

Replies: 0

Dears,

We create a custom check box at checkout level so we create a new snippet as per the below:

add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );
function custom_override_checkout_fields( $fields ) {
	    $fields['billing']['billing_checkbox'] = array(
        'type'      => 'checkbox',
		'required'=>false,
        'label'     => __('Please Click here if you have a child under the age of 3 and would like to receive a sampling box', 'woocommerce'),
        'class'     => array('form-row-wide'),
        'clear'     => true
		
			
    );

    return $fields;
}
add_action('woocommerce_checkout_update_order_meta','my_custom_checkout_field_update_order_meta');
function my_custom_checkout_field_update_order_meta($order_id) {
  	if ( ! empty( $_POST['billing_checkbox'] ) )
       update_post_meta( $order_id, 'billing_checkbox',  $_POST['billing_checkbox']  );
	
	
}
add_action( 'woocommerce_admin_order_data_after_billing_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );

function my_custom_checkout_field_display_admin_order_meta($order){
	
 $billing_checkbox = get_post_meta( $order->get_id(), 'billing_checkbox', true );
    if( $billing_checkbox == 1 )
       echo '<p><strong>Child: </strong> <span>you have a child under the age of 3 and would like to receive a sampling box</span></p>';
	

}

We are trying to add a free product once the above checkbox is clicked, so I added the below snippet with the free product id but does not work:

add_action('woocommerce_after_checkout_validation','place_test_request11');
function place_test_request11() {

	 $billing_checkbox = 1;
$free_product_id = 121674 ;
	global $woocommerce;
	if (  WC()->cart->billing_checkbox==$billing_checkbox) {
$product_cart_id = WC()->cart->generate_cart_id( 121674 );
if( ! WC()->cart->find_product_in_cart( $product_cart_id ) ){
	$woocommerce->cart->add_to_cart( 121674 ); 
}
      
}
}

Please can you help us in order to call the custom field and create the free product automatically after checked the checkbox?

Best Regards,