Small companies are embracing mobile payment-processing solutions such as Square, PayPal Here and GoPayment from Intuit. These systems allow business owners to accept payments by using their smartphones or tablet computers. In some cases, the quick payment options ease a business' cash flow. "If it's time to pay a bill, I reach into my briefcase, pull out my iPhone and clients give me a credit card," said Trippe Fried, who has a law practice in New York. "I can process it right on the spot."