Hi @samysalahgad đź‘‹
I need to know exactly where the content of the “checkout/order-pay” page located to edit it
To modify the content of the “checkout/order-pay” page, you will need to override the WooCommerce template files in your theme. These template files are located in the WooCommerce plugin directory under /plugins/woocommerce/templates/.
The specific file for the “order-pay” page is /checkout/form-pay.php. To override this file, you need to copy it to your child theme directory under /woocommerce/checkout/form-pay.php.
More details on the template structure and how to override templates can be found here:
https://woo.com/document/template-structure/
I hope this helps! If you have any further questions, feel free to ask.
Cheers.