Do e-commerce teams automatically test real customer journeys in production?

I’m curious how e-commerce companies make sure their store still works after updates or integrations.

Things like:

• browsing products

• Adding items to the cart

• checkout

• payment

Do you run automated tests that simulate real users and alert you if something fails?

Or do problems usually get discovered through analytics or customer reports?

I've created a SaaS (commerceprobe.com) that is solving the problem. I want to understand whether I should spend time and money to make the solution worldwide. I need honest answers.

Thank you for your opinion.