Using Bundlex with cart replacement apps (UpCart and similar)

Cart replacement and product-option apps can change how your add-to-cart button submits products. If a request is rebuilt without the form fields or line properties Bundlex needs, required bundle products or discounts may be missing.

What to check

Bundlex normally recognizes its product-form marker and adds private offer information to the cart lines. It also has a narrow recovery path when a recent add-to-cart action still matches the current form, variant, and selection despite a missing request marker. That recovery cannot cover every custom cart integration.

Missing properties do not prove that every discount will disappear: plain quantity tiers can still qualify. Check the actual products, quantities, gifts, and checkout discount rather than relying on the marker alone.

Resolve a conflict

1. Contact Bundlex support with the product URL, cart app name, and steps that reproduce the issue.
2. Check whether the cart app can preserve hidden form fields and custom line-item properties.
3. If support needs to isolate the cause, test the theme's normal add flow with the conflicting feature disabled in a theme preview.
4. Confirm the complete bundle arrives and the drawer refreshes with its discounted prices.

A cart drawer and an app that replaces the add request are different integration points. See cart drawers and add-to-cart troubleshooting.