Android 6.0, named Marshmallow, includes the native ability to complete Google Play Store app sales with a user’s fingerprint. To use the service, a user would need to own an Android phone that has fingerprint reader like the Nexus 6P and the Nexus 5X and have the newest 6.0 OS. If your phone qualifies then you’ll need to do a little extra work to activate the feature since it’s not activated by default. Go into your Play Store settings and check the “fingerprint authentication” box under User Controls. It’s a feature that’s already available on all new iPhones, so it’s no surprise to see Android begin to implement this functionality.
Read the full article here: The Play Store Supports Fingerprint Purchase Authorizations In Android 6.0