Woocommerce Bookings Redeem Voucher URL

Hi All I have Woocommerce Bookings running to sell courses and need a gift voucher redeem function adding as follows: - Customer who has received a voucher code goes to redeem url ([login to view URL]) and enters their code - Customer is shown details of the course their gift voucher entitles them too without price (as previously paid for) - Customer can book a date in the bookings calendar for their gifted course which talks straight to woocommerce bookings and adds it to the diary as any normal woocommerce booking would. Obviously there is no charge for this to the customer as they have a voucher code. I'd like this creating as a standalone plugin if required that doesn't alter the woocommerce bookings plugin so it can be updated. That's all, need this doing A.S.A.P Many Thanks! Paul