Creating vouchers for free orders including shipping and taxes

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Hi All, 


We have an opportunity to get marketing at a great event and the ask is for us to provide vouchers/codes so that people at this event can benefit from a $250 value on our store including shipping and taxes. It cannot be the cart pre shipping and taxes since the partner doesnt want anybody to pay anything if below $250


Is there a way to do this with apps, wholesale or a mix of things please? that would help a lot!


Thanks in advance,