Using a payment processor can be highly beneficial for its convenience, efficiency and swift delivery; however there are other reasons why it is useful for companies.
Payment processors store your money in the form of e currency. E-currency is the online value of your money in the form of dollar or euro etc.
Accepting credit card payments through your site is an absolute essential part of conducting business on the web. If you are not accepting online credit card payments and processing orders online, you are losing an enormous quantity of business.