1Password is one third-party app that will directly benefit from Extensibility and Apple’s Touch ID API, two features coming in iOS 8 that will let apps work together like never before. 1Password For Mac Demoed With Touch ID and Touch Bar Integration. AgileBits CEO, Jeff Shiner noted in a blog post that the team has already started working on implementing Touch ID and Touch Bar.

Where is the Touch ID sensor?

The Touch ID sensor is either in the Home button or—on iPad Air (4th generation)—the top button. When you follow the steps below, the onscreen instructions will tell you which button to use.

Set up Touch ID

Before you can set up Touch ID, you need to create a passcode for your device.* Then follow these steps:

1. Make sure that the Touch ID sensor and your finger are clean and dry.
2. Tap Settings > Touch ID & Passcode, then enter your passcode.
3. Tap Add a Fingerprint and hold your device as you normally would when touching the Touch ID sensor.
4. Touch the Touch ID sensor with your finger—but don't press. Hold it there until you feel a quick vibration, or until you're asked to lift your finger.
   
5. Continue to lift and rest your finger slowly, making small adjustments to the position of your finger each time.
6. The next screen asks you to adjust your grip. Hold your device as you normally would when unlocking it, and touch the Touch ID sensor with the outer areas of your fingertip, instead of the center portion that you scanned first.
   

If you have trouble enrolling one finger, try another. Still need help setting up Touch ID?

* Touch ID and Face ID are available on certain iPhone and iPad models.

Use Touch ID to unlock your iPhone or make purchases

After you set up Touch ID, you can use Touch ID to unlock your iPhone. Just press the Touch ID sensor using the finger you registered with Touch ID.

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Make purchases with Touch ID

You can use Touch ID instead of your Apple ID password to make purchases in the iTunes Store, App Store, and Apple Books. Just follow these steps:

1. Make sure iTunes & App Store is turned on under Settings > Touch ID & Passcode. If you can't turn it on, you might need to sign in with your Apple ID in Settings > iTunes & App Store.
2. Open the iTunes Store, App Store, or Apple Books.
3. Tap something to buy. You'll see a Touch ID prompt.
4. To make a purchase, lightly touch the Touch ID sensor.

Use Touch ID for Apple Pay

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With an iPhone 6 or iPhone 6 Plus or later, you can use Touch ID to make Apple Pay purchases in stores, within apps, and on websites in Safari. You can also use Touch ID on your iPhone to complete website purchases from your Mac. If you have an iPad Pro, iPad Air 2 or iPad Mini 3 or later, you can use Touch ID for Apple Pay purchases within apps and on websites in Safari.

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Manage your Touch ID settings

Go toSettings > Touch ID & Passcode to manage these settings: Good talk by mira jacob.

• Turn Touch ID on or off for Passcode, iTunes & App Store, or Apple Pay.
• Enroll up to five fingerprints. Each new print might make fingerprint recognition take slightly longer.
  
• Tap a fingerprint to rename it.
• Swipe to delete a fingerprint.
• Identify a fingerprint in the list by touching the Touch ID sensor. The matching print in the list will be highlighted briefly.

Press the Touch ID sensor using Touch ID to unlock your device. To unlock your device using Touch ID without pressing the Touch ID sensor, go to Settings > Accessibility > Home Button [or top button] and turn on Rest Finger to Open.

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