This type allows you to generate vouchers that can only be redeemed once, validated by you or an employee by scanning a unique QR code that appears on each voucher.
Pricing of the one-time redeemable vouchers works on a Pay-as-you-go model. Each extra voucher is $0.015 and you can buy them from your user's area.
Login into your free account, create a coupon, set the number of vouchers for the coupon, download the vouchers, test a voucher and get redeeming statistics.
Create a one-time redeemable coupon with unique vouchers. Then merge them with your contact list in Mailchimp to include the vouchers in your campaign.