Quantity limits cap how many units can be bought with a deposit:
Max per order: the most units in one order.
Max per customer: the most units one customer can buy across all their orders. This is checked for signed-in customers.
Total cap: the most units the offer sells in total. When it's reached, the offer turns itself off.
Where to find it
Depositly → Purchase options → your offer → Where it applies → Quantity limits
How to set it up
Open your offer and go to Where it applies.
Scroll to Quantity limits.
Enter the limits you need. Leave a field empty for no limit.
Click Save.
Good to know
Max per order can't be higher than max per customer, and neither can be higher than the total cap.
Quantity limits don't apply to cart offers, because the deposit covers the whole order.