[Woo POS] Coupons: Show an error and CTA to proceed without Coupons - Dummy UI

[staskus]

– In the case of multiple coupons, a single error message appears for the first invalid coupon.
– Order is not created and card reader payment is not automatically started. CTA allows to proceed with order creation and payment without coupons

[dangermattic]

Thanks for reporting! 👍