I am requesting a bid for this or a similar coupon module for an oscommerce website.
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Create coupon codes for your customers to use for discounts on orders.
Discounts are applied before tax and are displayed as one order total line for each applicable tax class. You can configure whether to display the order subtotal including the discount, or before the discount is applied.
Coupon codes may be configured with a start or ending date, number of times they may be used, and an order minimum.
and assistance activating usps postal settings.