I booked a flight in India with Go Indigo. I booked it online, from Canada. A few weeks later I got an email with a tax invoice that says that the "taxable amount" is 123 Rupees. I don't understand what this document is for. Is it a bill that I have to pay? If so, how? Is it for my records for some reason? If so...what am I supposed to do with it? The amount isn't big at all so I'm not worried about paying it, but I am worried about not paying it and finding out that my ticket got cancelled because I didn't.