Is there an event or place I can plugin for when a shopping cart price rule is no longer valid (such as when it expires or if you change the quantity of other products where it no longer applies)? I know that it is automatically removed from the cart, but I can't seem to find the place this is happening in the code.
I am writing a module that adds a free product to the cart for a coupon where the subtotal is more than X amount. It is all working except for when reducing the quantity of items in the cart where the subtotal goes below X. The coupon is getting removed, but my product is staying in the cart.
So far I've tapped into the following events to do what I need so far...
salesrule_validator_process checkout_cart_update_items_after sales_quote_collect_totals_before
I did find
Magento\Quote\Model\CouponManagement which seemed promising since it has
remove() methods, but they don't appear to be getting called when the cart is updated.
checkout_cart_update_items_after it also seems like a logical place I can check, but it appears the rule is still set according to
UPDATE: I ended up adding an observer for the
checkout_cart_save_after event which runs after
collectTotals() so knows if the rule is still on the cart or not. Then I basically compare
$quote->getOrigData('applied_rule_ids') to see if the rule has been removed. I feel like there is a better way to do this, but it works for the moment. I still have the issue with coupons that expire though...