A few days ago I bought a seat online, I would like to know the different from the minted seat, since I expected when buying online it would still be part of the minted seat but now I see that I have 2 different payments, one for online seat and others minted seat
A description of minted seats is in
nastyfans policy.
It is not possible to add seats to existing minted seat coins. When seats are minted to a coin then it is final for that coin. You can mint your online seats to new coins. Or from NastyShop you can purchase minted seat coins that contain multiple seats.
Online seats receive same distribution amount as minted seats. A advantage of online seats is you control payout threshold and you control payout address. A advantage of minted seats is automatic cold storage of Bitcoins and additional value of silver and unique features of minted seat coins.
You could set online seat payout address to your minted seat address. This is similar result of adding seats to minted seat coins.