How can I add purchase guarantee HTML Block to checkout page

Hello,

Try to add the following PHP code snippet to the child theme functions.php file to do this

if ( ! function_exists( 'xts_add_purchase_checkout' ) ) {
   function xts_add_purchase_checkout() {
      echo do_shortcode( '[xts_html_block id="871"]' );
   }

   add_action( 'woocommerce_review_order_before_submit', 'xts_add_purchase_checkout' );
}

Kind Regards