A credit card payment app can help small businesses save time and money, especially if they're not ready for a full point-of-sale system. Here are our top picks.

The American Cancer Society, for example, asks donors to pay a 5.5% fee to help pay "transaction & processing fees, web support and receipts. It also includes costs associated with cyber security ...

Northwestern accepts American Express, Discover, MasterCard, and VISA. Note that while there is a 2.6% service fee for all credit card or debit card payments, there is no service fee for eCheck ...

And people keep signing card receipts out of habit—even when there is no blank space for it—because it feels weird not to, payment networks and retail groups say.