It may take two to tango, but payments now are as easy as one touch.

Four Carnegie Mellon University seniors tired of digging through backpacks, pockets and purses for their student identification and debit cards have developed PayTango, a fingerprint-based identification and payment system.

With majors ranging from information systems and human-computer interaction to industrial design, Brian Groudan, Kelly Lau-Kee, Umang Patel and Christian Reyes combined their expertise to launch their startup.

“We believe you should be able to walk into any establishment and prove who you are without carrying anything — no apps, no cards,” Groudan said. “PayTango can be used for everyday activities like paying for a morning coffee or critical scenarios like identifying patients’ medical information in a hospital.”

The startup is attracting attention from media and potential investors. Inc. magazine recently named it among “America’s Coolest College Startups” for 2013.