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If I understand correctly what you would like to achieve, it is to change the currency of your payment processing tool.
If that is so, all you should do is to click on the payment processing tool and then to click on the Currency option in the toolbar above:
Then just select Indian Rupee.
There is however one important thing to note, and that is that not all of the payment processing tools allow you to select INR as the currency, so it is available for:
2. Purchase Order
The one that do not support INR are:
7. PayPal Express
8. PayPal Pro
So if you are going to accept the INR on your forms, you must use one of the first 3 payment processing tools.