Where Discounts Appear
First, understand where bundle discounts show:
Location | Discount Visible? |
Product page | Shows estimated savings |
Cart | Yes — discount applied here |
Checkout | Yes — discount applied |
Order confirmation | Yes — shows discounted prices |
Important: The actual discount is applied via Shopify's Cart Transform at the cart and checkout stages.
Check 1: Did You Set a Discount?
Open your bundle in MOD Bundles and verify the discount settings.
For Mix & Match and Collection Bundles:
Open MOD Bundles
Click your bundle to edit it
Look at the Pricing section
Confirm you selected something other than "No discount"
For Pack Builder:
Open MOD Bundles
Click your pack to edit it
Check the pricing mode (Fixed Price or Percentage Off)
Verify each pack size has a discount or price set
Check 2: Is the Cart Transform Installed?
MOD Bundles uses Shopify's Cart Transform to apply discounts. This is installed automatically when you create your first bundle.
How to verify:
Go to Settings → Apps and sales channels in Shopify admin
Find MOD Bundles
Click it and look for Cart Transform or Functions
If Cart Transform isn't working:
Try creating a new bundle (this reinstalls the function)
Contact support for help reinstalling
Check 3: Is the Bundle Complete?
Discounts only apply when the bundle is complete:
Bundle Type | Complete When |
Mix & Match | Required quantity of items added |
Pack Builder | Items equal pack size |
Collection Bundle | All required steps filled |
Check:
Did the customer add enough items?
For Pack Builder, is the pack full?
For Collection Bundle, are all required steps completed?
Check 4: Are Bundle Items in the Cart?
The discount only applies to items added through the bundle interface, not items added separately.
How bundles work in cart:
Bundle items are grouped together
They have special metadata identifying them as bundle items
The Cart Transform recognizes them and applies the discount
If items were added separately:
Remove them from cart
Go back to the bundle product page
Add items through the bundle interface
Check 5: Test in Incognito Mode
Sometimes browser cache or cookies can cause issues.
Open an incognito/private browser window
Go to your bundle product page
Add items to the bundle
Add to cart
Check if discount appears
Check 6: Check for Conflicting Apps
Other apps that modify the cart or checkout can sometimes conflict with MOD Bundles.
Common conflicts:
Other bundling apps
Discount apps
Cart drawer apps (sometimes)
Checkout customization apps
How to test:
Temporarily disable other apps that modify cart/checkout
Test your bundle
Re-enable apps one by one to find the conflict
Check 7: Verify Cart Transform is Running
If you have access to browser developer tools:
Open your store with the bundle in cart
Open developer tools (F12)
Go to the Network tab
Look for requests to
/cartor checkoutThe response should show modified prices
Discount Shows But Amount Is Wrong
If the discount is applying but the amount is incorrect:
Check that you entered the right percentage or fixed amount
Verify the discount type matches your intention
Discount Shows on Product Page But Not Cart
The product page shows an estimate of savings. The actual discount is applied in the cart.
If cart shows no discount:
Make sure items were added via the bundle (not individually)
Check that the bundle is complete
Verify Cart Transform is installed
Still Not Working?
If you've tried everything above:
Create a test bundle:
Make a simple 2-product bundle Set a clear discount (like 50% off) Test if that worksCheck Shopify status:
Visit status.shopify.com Cart Transform issues can sometimes be Shopify-sideContact support:
Share your bundle name and settings Describe exactly what you see vs. what you expect Include screenshots of cart if possible