Question about buying Android Apps

Hello Guys,

Sorry if this is not the right place to post this thread. The thing is that yesterday I bought this app called Tapatalk and in the store was for $2.99. When I go to my bank account I have two transactions from Google. One for the $2.99 and another for $1.00 and it says - IN PROCESS PURCHASE GOOGLE ON 08/12/12

Do they charge a $1 for every purchase?... what is this $1?

Thanks

 

Thanks guys... I'll be looking at the account tomorrow and see how it goes. This is my first purchase in the Google Play Store.