what is a sales slip ? why is it important to keep it?
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Examples from the web for sales slip Expand
Without a sales slip, the merchant may only be willing to refund the post holiday sale price.
The same employee also gives the customer the check or sales slip, and receives payment from the customer.
Some stores may also require a sales slip when an item is returned.
a receipt or other slip of paper issued by a store or other vendor showing where a purchase was made and also the amount, date, department, etc.