Mastercard is launching new mobile technologies that will allow customers to authenticate their online purchases using selfies or fingerprints. The technology will be rolled out by big banks in the U.S., Canada, the U.K. and some European countries over the next few months. People from around the world will be regularly using this authentication technology within five years, said Ajay Bhalla, president of enterprise security solutions at MasterCard.

Mastercard plans to roll out the technology to the UK, US, Canada, Netherlands, Belgium, Spain, Italy, France, Germany, Switzerland, Norway, Sweden, Finland and Denmark.

Customers who want to try selfie authentication will have to download a special MasterCard app that will allow them to take a photo each time they make an online purchase. Their face (or fingerprint) will be scanned to prove that they — not hackers or thieves — are making a purchase.

The scan will verify that it’s a legitimate selfie — instead of a previously taken photo — by requiring users to blink when they take their own photo. The fingerprint authentication can be used on new smartphones, including the iPhone 6 and iPhone 6S. MasterCard said it’s also working on other ways to authenticate purchases, including monitoring a customer’s heartbeat. Iris scans and voice recognition are also being explored.