Vouchers that are set to apply to all customers do not appear in these
locations: the customer has to know about them in order to use them.
In order to apply the voucher, the customer need to visit his cart and
enter the voucher in the suitable field and click "Add". The customer won't
be able to apply the voucher if he checks out immediately.
Once applied, the cart summary displays the voucher's impact on the
order's amount:
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