[Google Maps API v2] Google Places API

Let me share my findings before asking the question.

Google Places API documentation says:
"Note: To use the Google Places API you must first request a Maps API
client ID and cryptographic key which you must use to sign your
request URLs. For information on signing URL requests, please see the
URL Authentication documentation within the Web Service APIs home
page."

1. The Google Places API is still in developer preview.
http://code.google.com/apis/maps/documentation/places/

2. We need a Client ID (required) and a Signature (required) to use
the Google Places API.
http://code.google.com/apis/maps/documentation/webservices/index.html#URLSigning

3. And, to get the Signature, we need a Google Adsense account to get
Adsense publisher id (required).
http://gmaps-ws-console.appspot.com/

4. You can find the requirements to use the Google Places API here.
http://code.google.com/apis/maps/documentation/places/index.html#Requirements

5. The Signup page for Google Maps API suggest that, "Your service
must be freely accessible to end users. To use Google mapping
technology in other types of applications, please use Google Maps API
Premier. See this FAQ for more information."
http://code.google.com/intl/it-IT/apis/maps/signup.html

Now, here's what i want to know.

I'm planning on using Google Places API in my iOS application. I don't
want to use Adsense. Can i still access the Google Places API for
free? How?

If i can't access the Google Places API for free, what are the costs
associated with using this service, and the available payment models?
I wasn't able to find any particular resources for this information.

Here's a specific scenario. What if my iOS application is free. The
free version uses Google Places API. But... my iOS application has
some additional features which are exposed using In-app Purchase (paid
features). The paid features do not use Google Places API. Is this
acceptable?

Thanks.

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