I personally wouldn`t use paypal for your business unless your sales volume is really small (or you`re on ebay). The cost and fees are very expensive compared to what other vendors charge for their processing.
I would check out Quickbooks, COSTCO or Charge.com, compare prices and decide which is better for you. I think all of them would be less expensive then Paypal and you have more control and can grow your business with them.
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