CODE EXAMPLE FOR PHP

woocommerce thank you page

/**
 * @snippet       WooCommerce add text to the thank you page
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli
 * @testedwith    WooCommerce 4.5
 */
  
add_action( 'woocommerce_thankyou', 'bbloomer_add_content_thankyou' );
  
function bbloomer_add_content_thankyou() {
   echo '<p>Some HTML content!</p>';
}