| Situation | Rule |
| Flash Sale vs. Seller Discount Price | β Cannot stack β Flash Sale price shows; seller discount does not apply |
| Flash Sale vs. Hero Product Boost (Platform) | β Cannot stack β Flash Sale price shows |
| Flash Sale vs. BMSM | β
Can stack (effective June 5, 2025) |
| Flash Sale vs. Seller Coupon | β
Can stack |
| One product in multiple Flash Sales | β A product can only be in one flash sale at a time |
| Campaign Price vs. Flash Sale | β Campaign price applies; regular flash sale does not |
| BMSM vs. GWP | β A product can only be in BMSM or GWP β not both |
| Seller Discount Price vs. Hero Product Boost (Platform) | β
Can stack |
| Seller Shipping Discount vs. Platform Shipping Discount | βΉοΈ Priority: Co-funded free shipping > Platform shipping > Seller shipping |
| Multiple Seller Coupons active | βΉοΈ Best price auto-shown; buyer may choose |
| Co-funded Boost vs. any Seller promotion | β Co-funded Boost takes priority; seller promotion does not show (except Shipping Discount and Coupons which can stack) |
| Co-funded Livestream Flash Sale vs. any Seller Flash Sale | β Co-funded Livestream Flash Sale takes priority |