Discount for one free product - but multiple pricing schemes

Hi there,

What's happening is a daily deals company is selling voucher codes for one product on our store.

The customers can then go on to our website, enter this voucher code, and receive one free product.

BUT we have volume pricing on the website - buy 3 and you get a different price per product, buy 5 - 10 and you get a different price.

How can I set this up with AWO Coupon that people ONLY get 1 free pair, regardless of the volume pricing?

This is not possible with AwoCoupon alone, as you would need to restrict the quantity. It might be possible with Purchasing rules: https://polishedgeek.com/paid-extensions/virtuemart-purchasing-rules/overview-a-features.html?amigosid=3