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The Gang Sheet Builder speaks to the product page through the same channels every Print.App editor uses. Nothing here is required to use it; this page is for stores with their own pricing logic or integrations.

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Live pushes while the customer works

After every re-pack the builder sends the billable value to the Price target configured on the design: In Transfers by size the value is the total copy count, sent to po:quantity or to the selector named.

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The saved design

When the customer saves, the app:saved message the Print.App client receives carries a canvas object beside the usual project fields:
h is the billed length across all sheets. With Print Options the client hands this to the widget as the file’s canvas, which is what a Per length modifier prices from and what is verified on our servers at add-to-cart. In Transfers by size the object also carries mode, copies, totalArea and an items array with each design’s size and copy count; the client forwards the items on the file record for the production ticket.

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Price readback

With Price display source set, the builder registers for the page’s price and shows it in its summary:
  • po:price — the Print Options widget sends its total, currency and availability on load and on every change.
  • a CSS selector — the client watches the element’s text and sends it on every change. The element must show the line total for the number to mean anything in the builder.
The displayed price never feeds pricing; it is a mirror of the page.

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Layout validation

Before checkout the builder re-sends the sheet’s placements to the packing service, which checks them with the same geometry it packs with: inside the film, clear of the edge padding, no two pieces closer than the gap. A customer’s manual nudge that breaks a rule blocks Preview & Save with the reason listed, and Auto-nest clears it.