One store coupon per store. If your cart has items from three stores, you can apply each of those stores' coupons at the same time.
Plus one platform-wide LetItRip coupon, on top of any store coupons.
A second coupon for the same store, or a second platform-wide coupon, will be declined — remove the first one to swap it.
Where each discount lands
A store coupon only discounts that store's items.
A platform-wide coupon is spread proportionally across every store in your cart.
Orders are placed per store, so each store's order shows its own share of the discount.
Why a coupon might not apply
The eligible items in your cart are below the coupon's minimum purchase amount — minimum spend is measured against the items the coupon actually covers, not your whole cart.
The coupon has expired, or hasn't started yet.
The coupon is limited to certain products or categories, and your cart has none of them.
The coupon is first-order-only and you've ordered before.
You've already used the coupon the maximum number of times allowed.
The coupon ran out — some coupons have a total limit across all buyers.