Adding support for coupon code limits is something we would like to add in the future. In the meantime, you could try the social voucher add-on. It lets you discount a ticket by 100% with a one-use promo code. It will let you import the same code 100 times, which would work in this case.
Please make it clear in the Describe your organization box that you are an existing customer and are wanting a possible discount for the Social Coupons add on.
The new promotions add-on for Event Espresso 4 adds a feature you can use to limit the number of uses per coupon code. You can learn more about the Promotions add-on here:
The support post ‘Limit the number of coupons used per code’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.