If you are a business operator, you know well the caliber of your customers or new encounter customers. And there maybe a time when one or two customers want to buy some products through credit. Will you say yes impulsively or retreat the idea to let those customers purchase on credit. Well, you can approve their request, however let them deposit post dated checks for an assurance of payment refusal from them means cancellation of their request. You never know their real motives. But it's all up to you to allow or not to allow.