Need info on App Purchase

Hi all

I m from India, I recently made my first purchase on BlackBerry word of worth rs 50 via debit card, and it is really weird to see that deducted amount was rs 150 in total
Now I don't get it why extra 100 rs!???
Or it is like compulsory on first purchase??
Need to know this

Thanks all :-)

Posted via CB10

When I did my first blackberry world purchase I was charged with the app price, no other fees; I used PayPal though.
I know that Google Play store does a small charge to validate your credit card and it is later reimbursed, I'm wondering if blackberry world does the same.