Web-to-print on WooCommerce

• Product options

  Simple fixed choices can be attributes and variations. Open-ended print choices such as custom width and height, stock, finishing and quantity are stored as cart item data. Product add-on extensions can add option fields with fixed or percentage surcharges, which suits simple cases but not a calculation that depends on sheet yield or finishing sequence.

• Price

  The hook woocommerce_add_cart_item_data attaches the configuration to the cart line, and woocommerce_before_calculate_totals lets server code recalculate the line price from a print pricing engine each time totals are calculated. The browser's estimate is never trusted.

• Artwork and design

  An online designer on the product page saves the design and adds its identifier to the cart item data. After payment, the production PDF is generated from that identifier to the contract in print-ready PDF and prepress automation.

• Order to job

  In the classic checkout, woocommerce_checkout_create_order_line_item persists configuration on the order line. An order status change or webhook then triggers the adapter that submits one job for each order line to the MIS, hot folder or fulfilment partner.

• Block checkout runs through the Store API

  WooCommerce's block-based Cart and Checkout talk to the server through the Store API, with its own cart tokens and extension points. An integration written only for the classic shortcode checkout must be tested against the block checkout too, and cart item data must be exposed to the Store API if the blocks are to display it.

• High-Performance Order Storage

  With HPOS, orders are kept in dedicated order tables rather than as WordPress posts. Print data must be read and written through WooCommerce's order objects, not raw post meta, or it silently disappears when HPOS is enabled.

• Plugin load and upgrades

  A print store often runs a page builder, a designer, add-ons and payment plugins at once. Each WooCommerce or WordPress update can change a hook's behaviour, so the integration keeps its logic in one plugin with automated tests for the cart, checkout and order path.

WooCommerce has no documented variant ceiling of the kind Shopify publishes, so the argument here is less about workarounds and more about a clean output contract and a codebase that survives upgrades.