United Airlines, GoDaddy & Causemo among latest businesses offering Apple Pay

United is supporting Apple Pay in its iOS app. People can use the app to book single and multi-point trips, as well as flight upgrades when available. Another new option is PayPal, still the most common online payment method.

GoDaddy is offering Apple Pay to merchants operating online stores, as long as they enable mobile credit card payments through Stripe.

Causemo — which has clients like the Boys & Girls Clubs of America, and Keep America Beautiful — is activating Web-based Apple Pay, which should in fact appear as the default payment option on compatible devices running Safari. When donors visit a site using Causemo, Apple's technology will let them skip entering any billing or contact information, and in theory provide extra security.

Wider merchant acceptance remains a problem for Apple Pay. The platform is currently supported by 35 percent of U.S. merchants, but many still don't offer it, among them major chains. One of the bigger obstacles is infrastructure, since retailers must often upgrade payment terminals to make them compatible with the NFC chips in iPhones and Apple Watches.