Assuming you mean "What **Unity** license do I need?", Google Play is a market for the Android phone. So in order to develop a Unity app for the Android phone, you will need the Android license. See [this page](https://store.unity3d.com/) for more details.
Next time, please bother Googling your question before posting here, this question doesn't really belong here. It's explained quite clearly on Unity's website.
If you meant to say what "Google Play license do I need?", look at [this page](http://support.google.com/googleplay/android-developer/answer/186113?hl=en) on Google's website that explains that clearly as well.
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