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Plan: Starter (3 rules) or Pro (10 rules).
A cross-sell rule says: when a trigger product is in the cart, show these products as an offer in the popup’s order summary. The buyer adds one with a tap, in either checkout mode. Open Settings → Cross-sells.

Building a rule

1

Name the rule

For your own reference only; buyers never see it.
2

Pick the trigger products

Up to 20 products. The rule fires when any of them is in the cart.
3

Pick what to offer

Up to 2 products per rule. Choose whether to charge a specific variant or let the buyer choose their size.
4

Order your rules

Rules are matched top to bottom. Drag to reorder, and use the per-rule switch to pause one without deleting it.
You can also set one optional section heading shown above the offers, shop-wide.
At most 2 offers appear in any one cart, however many rules match. The offers sit at the end of the order summary on desktop, and right after the continue button on mobile.

Tips

Case with phone, filter with jug, batteries with a toy. A random offer is noise the buyer scrolls past.
Pinning a variant works for one-size accessories. For anything with sizes, “let the buyer choose” avoids a return.
The cross-sell should feel like a small addition to a decision already made.