First, is this for an in-person discount or online store discount? The online store has discount codes (coupons) that can be set for a certain discount amount based on a dollar amount or quantity purchased. You could set the discount for the amount of the free item and instruct the customer online to purchase 50$, add the free item, and use coupon code 50free to get the item free.
In person there isn't a dollar amount discount that I have used. They are item and category based. It would be easy to put an item in that is 0$ or a discount button for that item amount and just hit that button when they are checking out when you have the subtotal right there.
I know you may be looking for an automatic way to do this, but I don't think it is available for a dollar amount of purchase. It is currently looking like it is made for if you buy a widget from this category you get 10% off...or if you buy this widget it is 10% off automatically.
Hope this helps.
Donnie-M
Donnie
Multi-Unit Manager | Founder, Table & Ledger
tableandledger.com
Square AI Champion | Using Square since July, 2017
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