Their write-up on the website says that when you use Google Checkout to process your sales, you'll be charged rates as low as 1.9% + $0.30 per transaction, depending on your monthly sales volume. And there are no monthly, setup or gateway fees. Have a look at below screenshot which shows the exact transaction charges for processing with a card.
App Developers Payment through Google Playstore
Now Indian developers will now be able to sell paid apps via Google Play Store also. The transactions costs are higher for app developer as it follows a 30:70 model – it takes 30 per cent of the total app price as transaction fee while developers get the rest. If an app sells digital goods (like in-game purchases) or subscriptions, the company takes 30 per cent of that amount as well.
To be honest we are still not sure that whether Indian publishers can integrate it in their website as at some places it is given that it is available for US and UK publishers only.
It appears that Google has allowed Indian merchants since 19 Oct 2012. A lot of things need to be clarified on these issues and we will update you.