Topic
Step-by-step guides for getting things done in WordPress.
WooCommerce
The hook fires once per Place order click, before WooCommerce reads or validates the posted data. Any error notice you add stops the order. It does not run in the block checkout at all.
WooCommerce
The action fires in almost every order email, in both HTML and plain text, for the customer and the admin. Output that ignores those arguments ends up in the wrong email or prints raw tags in plain text.
WooCommerce
The hook fires inside the data store, before the order's line items are written, for every order that is created outside a draft status. Reloading the order by ID inside it returns an order with no items.
WooCommerce
The filter decides which gateways a shopper sees and which ones the checkout accepts on submit. A condition that reads differently at those two moments produces an Invalid payment method error instead of a hidden option.
WooCommerce
Whatever you return from this filter becomes part of the cart item's identity, is saved in the session with it, and is empty in the block add-to-cart request unless you fill it from the Store API request yourself.
WooCommerce
The hook runs every time WooCommerce recalculates the cart, which can be several times in one request and not at all in another. Price changes made here have to be idempotent, and the mini cart needs its own answer.
WooCommerce
WooCommerce blocks the order with this message when the cart needs shipping but it has no country to ship to, or when shipping costs are hidden until an address is complete and the address never becomes complete.
WooCommerce
The notice is not about broken product data. It means the archive query for this exact URL returned zero rows, and the cause is usually visible in the URL, the visibility terms or a stale lookup table.
WooCommerce
WooCommerce says a payment method is invalid when the gateway the shopper picked is no longer in the list of available gateways by the time the order is submitted. Here is how to find out what removed it.
WooCommerce
WooCommerce shows the expired-session notice when the checkout arrives with an empty cart, usually because the session cookie never reached the server or a cached page carried someone else's nonce.
WordPress Tutorials
Splitting a long form into steps helps only when the steps follow how people think about the task. Here is when to split, how to use conditional logic, and the caching trap that breaks multi-step forms.
WordPress Tutorials
A file upload field turns a contact form into a way for strangers to put files on your server. Here is how to set types and size limits, where the files end up, and how to keep them private.