What will happen to the codes I inserted to thankyou.php if an update happens?

Hey @rolandc3

When I was finished, I read somewhere that if my WP theme updates or the plugin updates, the codes I inserted will disappear?

That’s correct. If you make changes directly to the files of a theme or plugin, those changes will be lost when you update that theme/plugin.

This is why we recommend never directly editing files. Instead, changes should be placed in their on area.

In your case, what you’d want to do is create a child theme. Then add a template override in your theme that contains the custom code.

Your theme’s developer should be able to provide you with a child theme.

You can then follow the guide on this page to get the templates for your version of WooCommerce:
https://docs.woocommerce.com/document/template-structure/

You’ll want to add the appropriate template (thankyou.php) to your child theme and then make the changes there. This way when you update WooCommerce your changes won’t be lost, as they are contained in your child theme.

If you need help implementing this, I’d suggest checking sites like https://www.codeable.io for skilled third-party developers.

We haven’t heard back from you in a while, so I’m going to mark this as resolved – if you have any further questions, you can start a new thread.