Same discount code accumulated on cart & checkout page

Technical Q&A

Topic summary

A merchant is experiencing an issue where Shopify discount codes are being applied twice—once on the cart page and again on the checkout page—resulting in customers receiving a 10% discount stacked on top of another 10% discount.

Current Setup:

  • Using Shopify’s native discount code function (10% off)
  • Using USO: Discounts & Promotions app (BOGO deal)

Problem:
When customers enter the same discount code on both the cart and checkout pages, the discount accumulates incorrectly, applying double the intended discount.

Desired Solution:
The merchant wants to remove the discount code input box from the cart page and keep it only on the checkout page to prevent this duplication issue.

Status:
The issue remains unresolved, and the merchant is seeking help to fix this problem.

Summarized with AI on November 11. AI used: claude-sonnet-4-5-20250929.
1

I’m currently using both 1. Shopify’s discount code function and 2. USO: Discounts & Promotions.

  1. Shopify’s discount code: 10% off
  2. USO: Discounts & Promotions: BOGO deal

but last night, shopify’s discount code were accumulated when customers enter the code twice on both cart page and checkout page. (10% off on cart page and another 10% off on checkout page)
So I’d like to remove the discount code box on my cart page only leave it on checkout page.

However, I can’t find a solution for this. Can anyone help…?

checkout page.jpg
checkout page.jpg489×496 20.9 KB

cart page.jpg
cart page.jpg1128×774 57.3 KB

https://www.venchi.com.tw

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