Until now selected OEM's have fingerprint scanning technology on their smartphone. But the latest Android 6.0 Marshmallow will support the fingerprint feature at the API level, which means developers can now add fingerprint API to their apps.
The native fingerprint support for Android Marshmallow will enhance the Android Pay for users to confirm the payment with their fingerprint. In addition to that, this feature will allow users to sign-in or authenticate on apps or unlock the device without the need of password or pin.
If you are using the Android Marshmallow smartphone that features a fingerprint scanner such as Nexus 6P or the Nexus 5X. Then you can also be used to authorize payments made with Android Pay as well as to authorize purchases on Google Play. If you are not aware of the fingerprint scanner for Google Play Store then, here is how to do it.
Google Play Store
Open Google Play Store and select menu.
Go to settings in the Google Play Store.
Now tap on the Fingerprint authentication tab.
Enter your Google password, and hit OK.
Once you approve with Google password, the fingerprint authentication is now enabled.