The WooCommerce checkout is a system, not a page
People ask me to 'fix the checkout'. The checkout isn't broken, it's the collision point of pricing rules, taxes, shipping and payment providers. That's where the work is.
The checkout is where every promise the store makes gets tested at once. Discounts, taxes, shipping, stock, payment. When merchants say the checkout is broken, what they usually mean is that these systems disagree with each other somewhere a customer can see.
A pipeline, not a page
I think of checkout as a pipeline with well-defined stages: validate the cart, compute pricing, apply rules, collect payment, confirm the order, tell the rest of the business. Each stage has inputs and outputs. The reliability problem is almost always that a stage runs in the wrong order, or runs twice with different results.
Where it breaks
- Discount rules applied inconsistently across cart and product pages.
- Tax or shipping totals computed in a plugin that nobody can explain.
- Payment gateways that confirm in their own system but report back late.
- Order data that never reaches the CRM or the email automation.
A reliable total is more valuable than a beautiful checkout.
Make the pipeline explainable
The standard I hold this to is simple: every line on a customer's invoice should be explainable, by you, your developer, and ideally your support person. If a discount amount can't be traced back to the rule that produced it, the checkout has a mystery in it, and mysteries are where revenue quietly leaks.
So when I work on WooCommerce, I spend more time on the order of operations than the pixels. Get the pipeline right, and the page becomes the easy part.