Hi there. New to Zapier. I am Pizzeria owner masquerading as a wannabe marketeer. My problem is the following 

I have a campaign where customers are offered a free pizza. Buy one get one free effectively . The free pizza has to be claimed and a form with their contact details etc is filled in.They are then sent a voucher with a code via text (sms) 

 This is entered in at checkout via our third party online ordering system.  I need to know how to make it both redeemable and trackable by our EPOS system and Zapier. So we get a notification when the offer has been redeemed and we can then reach out to the customer. I Can anyone recommend a solution to this using Zapier? If i need to change epos supplier I am happy to do this.