Buy buttons

Quantity, Add to cart, the express checkout button and, if you want, one-tap quantity buttons and a buy bar that follows on phones.

Where to find it

Built into its section; it cannot be added elsewhere.

Settings

Setting	Choices	Shows when	What it does
Show quantity rule	On · Off	Always
Show Shop Pay Installments	On · Off	Always	Shows the Shop Pay Installments banner when Shopify makes financing available for this product.
Show phone buy bar	On · Off	Always	Appears when Add to cart scrolls out of view. Quantity rules and stock limits still apply.

Quick add buttons

Setting	Choices	Shows when	What it does
Quantities to offer	Volume tiers (recommended) · Fixed list · Do not show	Always	Volume tiers uses each variant's price breaks. Pick a fixed list if products have no tiers.
Fixed quantities		Quantities to offer is Fixed list	Comma separated, e.g. 6,12,15. Quantities that break a product's rule are skipped.

Which settings reveal which:

flowchart LR
  quick_add_mode["Quantities to offer"]
  quick_add_quantities["Fixed quantities"]
  quick_add_mode -- "is Fixed list" --> quick_add_quantities

Before you start

Quantity rules come from B2B catalogs; see Quantity rules.