For which reason? Voucher is like a payment system and it is used only to give a specific product to an user. For example, user XYZ buy, on a kiosk, a voucher for a product with 200 hours
Then the user register itself on the Welcome Portal and, when he has to choose the product to buy, he can click on "Purchase through voucher"
and then he can fill the voucher code buy on the kiosk
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