Prestashop site - Generate non accumulative voucher

Avg Bid (SGD)
Project Budget (SGD)
$30 - $50

Project Description:
Need help in customized hook to generate shopping voucher that are not accumulative.
The voucher can only be use 1 time and cannot be used with other voucher.

Current code can generate voucher code when when user sign up. Need help to make this voucher to follow the have the above mentioned condition.

Skills required:
eCommerce, PHP, Prestashop, Shopping Carts, Website Design
About the employer:
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$ 200
in 3 days
$ 80
in 2 days
$ 50
in 1 days
$ 70
in 1 days
$ 45
in 2 days