Fix direct add, quick add modal, cart drawer, checkout buttons, quantity updates, and cart totals by testing simple and variant-heavy products separately.
Direct add is enabled for a product that needs customers to choose size, color, selling plan, or another option.
Open the product and confirm how many options and selling plans it has.
Use Quick Add modal for variant-heavy products. Use Direct add only for products that can be safely added without choices.
Send the product handle and the quick add mode used on the product card.
Quick add is disabled globally, disabled in the section, or the product cannot be purchased.
Confirm the product is active, available on Online Store, in stock or allowed to sell, and has a price.
Check Theme settings > Product selling and the product grid or featured collection section card settings.
Send the collection URL, product handle, and product card settings.
Cart drawer is disabled, the section uses a full cart redirect, or an app/custom script is interfering.
Test a normal product with no variants and no selling plan first.
Enable cart drawer in Theme settings, then test add, remove, quantity update, and checkout in the drawer.
Send a screen recording and list any cart, subscription, bundle, or upsell apps installed.
Payment setup, dynamic checkout settings, product availability, or cart drawer settings are incomplete.
Confirm payment providers, product availability, and checkout eligibility.
Check Show dynamic checkout in product and cart settings. Test the full cart page as well as the drawer.
Send screenshots of the drawer, full cart page, and payment setup state.
The drawer threshold copy does not match Shopify shipping rates, or discounts/taxes change totals later in checkout.
Review shipping rates, discounts, taxes, and markets for the customer's region.
Set the cart drawer free shipping threshold to the real Shopify threshold and clarify any taxes-included messaging.
Send the cart contents, shipping threshold, and region/market being tested.