At the moment, there is no possibility to run vouchers at CopeCart.

Yet, you can set a discount price for any of your products by adjusting the checkout template to make it look something like this:

Lower price

For now, it is not possible to display a reduced product price at the One-Step Checkout.

To make a lower price visible, go to the Product Edit page, select a Checkout form section and proceed to configure a Two-Step Checkout:

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