Empty cart
Show or hide the progress bar when the cart is empty. Some merchants show a teaser ("Add $50 to unlock free shipping") to nudge first-add behavior; others wait until the customer adds their first item.
Confetti
Toggle on / off / per-tier. Per-tier control lets you celebrate the big unlocks (free gift) without firing for every minor tier (5% off).
Gift position in cart
Top — Above other line items, hardest to miss.
Bottom — After regular items, near the totals.
Grouped — Mixed in with other line items in cart order.
Locked vs unlocked icons
Customizable lock icons (closed for locked tiers, open for unlocked). Use brand-matching icons for consistency, or stick with the defaults.