As far as the App Store goes I know the first time you purchase something after 
a restart of the phone you are prompted for your password. Once you have input 
the password one time, you will then be prompted to use the touch-ID for 
further purchases. 
Note that if you make a 2nd purchase within a short amount of time you will not 
be prompted for either.
I hope this helps, and is somewhat clear. 

> On Sep 28, 2015, at 1:57 PM, Les Kriegler <[email protected]> wrote:
> 
> I've never been able to purchase anything from the App Store using touch ID. 
> I haven't tried it under iOS nine with my new phone, but I'm wondering if I 
> will have the same issues.
> 
> Sent from my iPhone
> 
>> On Sep 28, 2015, at 3:31 PM, 'Kevin Cussick' via MacVisionaries 
>> <[email protected]> wrote:
>> 
>> Well your not alone I get the same thing every time I buy an app from the 
>> app store.
>>> On 28 Sep 2015, at 17:08, Mary Otten <[email protected]> wrote:
>>> 
>>> I am confused about the use of touch ID in places like the iBooks store, 
>>> app store or iTunes store. I thought I was set up for that. But I just 
>>> purchased an iBook. I hit the buy button and was prompted to sign in with 
>>> my password. I put my finger on the home  button for touch ID, nothing 
>>> happened. So I signed  in the usual way and the book was purchased. Now I 
>>> don't have a problem signing in. I have been doing it for a long time. But 
>>> I am confused as to how this touch ID thing is supposed to work. There must 
>>> be some setting I am missing. Or I just don't understand its operation.
>>> Mary
>>> 
>>> Sent from my iPhone
>>> 
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