WooCommerce cart and checkout

A WooCommerce payment gateway plugin from scratch When a regional payment provider has no WooCommerce plugin, you write one. The gateway class extends WC_Payment_Gateway: settings for the API keys and a test mode, process_payment() to start the payment, and a webhook that confirms it. The common case today is a redirect gateway: the customer pays…

Rate limiting for the WooCommerce checkout, registration and coupons Card testing bots use small shops to check stolen card numbers: they place hundreds of cheap orders, each with a different card, and the shop pays the gateway fees and risks its merchant account. Other bots register thousands of accounts or try coupon codes until one…

Content Security Policy for the WooCommerce checkout Card skimmers on online shops work by getting one extra script onto the checkout page: through a hacked plugin, a compromised third-party script or an injected database option. The script reads the card fields and sends them to the attacker’s server. A Content Security Policy tells the browser…

Plus and minus buttons for the WooCommerce cart quantity The cart page of WooCommerce uses a number input for the quantity. On a phone the spinner arrows are tiny or missing, and many stores want large “−” and “+” buttons instead. A short script adds them, keeps the limits of the input and updates the…

Use the woocommerce_checkout_fields filter to add new fields, remove unnecessary ones, and reorder the checkout form without a plugin.

Hook into WooCommerce cart page actions to display a hand-picked or automatically generated upsell product grid below the cart table.

Use WC cart add_to_cart to add simple and variable products to the cart via PHP for landing pages and promotional flows.

Add personalised messages, related products and custom content to the WooCommerce thank you page using action hooks.

Add a custom field to the WooCommerce checkout page The WooCommerce checkout collects the usual data: billing and shipping address, contact details, payment method. Real shops often need more at the moment of purchase: a gift message, a preferred delivery time, artwork instructions, a company VAT number. The checkout is the right place for it,…