Before the latest version of Android, only one option existed for keeping Google Play purchases secure: entering your password. But if you're using Android 6.0 Marshmallow -- on devices like the Nexus 5X or Nexus 6P -- then you've gained the ability to authenticate with your fingerprint instead.

Using a fingerprint is faster than typing in a complex password, and gives you the final decision on purchases if you share an account with someone else. Here's how to set it up:

Note: You will need to have fingerprint security enabled for this setting to work. For more information on setting this up, check out this post.

Step 1: Head to the Google Play store, open the slide-out menu and head to Settings.

Enlarge Image Nicole Cozma/CNET

Step 2: Scroll down to Fingerprint authentication and tap the check box next to it.

Step 3: Enter your password when prompted, and you're set.

Now you can skip typing in a password for any Google Play purchases. Instead, you'll see a pop-up asking for your fingerprint.

Which method do you prefer? Share your thoughts in the comments.