(English) How Can I Limit a Coupon to one Redeem per client?

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When a client redeems a coupon, he receives a special code (which is located within your app, on your client’s Members Zone)

To use the redeemed coupon, the client must present this code to redeem it. Once redeemed, the client can no longer use the same code. At this point, the client can redeem the same coupon, if still available on your app.  

You can’t limit the number of coupons a client can use, but you can charge for coupons