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Fix Discount Plugin Conflicts With Quantity Pricing

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Fix conflicts between quantity pricing and other discounts #

If quantity discounts from Price by Quantity & Bulk Quantity Discounts for WooCommerce stack with coupons or other discounts, go to WPFactory > Product Price by Quantity and, on the General tab, enable Other cart discounts. The quantity discount is then skipped for any cart that already has a coupon or another discount applied.

Symptoms #

  • Two discounts apply, so the total is lower than expected.
  • The quantity discount is ignored or replaced by another discount.
  • Discounts appear to apply in the wrong order.

Cause #

Several tools can filter the WooCommerce product price at once. Price by Quantity sets its price through woocommerce_product_get_price at the highest priority, so it usually applies last, but another plugin, a coupon, or theme code may still change the final figure.

Fix: stop quantity discounts from stacking #

  1. Go to WPFactory > Product Price by Quantity (also reachable at WooCommerce > Settings > Product Price by Quantity).
  2. On the General tab, enable Other cart discounts (alg_wc_wholesale_pricing_apply_only_if_no_other_discounts).
  3. Save. The quantity discount is now skipped for any cart that already has a coupon or another discount applied, so the two never stack.

Isolate a plugin conflict #

  1. Note every active plugin that touches pricing, discounts, or coupons.
  2. On a staging site, switch to a default theme (such as Storefront) and deactivate everything except WooCommerce and Price by Quantity, then retest.
  3. Reactivate the other plugins one at a time to find which one changes the price.

Developer note #

Price by Quantity already hooks woocommerce_product_get_price and woocommerce_product_variation_get_price at PHP_INT_MAX, so it runs after most other handlers. If another plugin still wins, adjust that plugin’s own price filter priority rather than the WooCommerce core hook, and test on staging.

Still stuck? #

Send your WooCommerce system status and a list of active plugins to our team on the Price by Quantity support forum.