A two-way mailer could be used to furnish a gift
certificate to the customer to encourage them to place an order. The
certificate would be torn off at the perforation and sent back with
the order.
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An open end envelope has an extended flap with a
perforation which acts as a receipt. The receipt is torn off the flap
and given to the customer. The customer will use the claim number
for reference in any dealings that pertain to that item.
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