So do I have to add transaction fee to every domain.

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No. There is smart way to handle this. You can "Add Funds"
to your account in one single transaction. For eg. You purchase $50 worth
domains every 3 months. Then you would add $50 to your whiz.in account. So you
will only be charged $1.75 in transaction fee. We recommend that you add atleast
$100 at a time.