This is the gradiation of card types. Differences mostly in the amount limit on the credit card or just simply how much money the owner has on the debit card.
Gradiation starts with CLASSIC and ends with INFINITIE. (in your types the biggest is PLATINUM)
IDk maybe 5k. I been playing around with 2 methods. Either use a card as fast and as many times as you can, or slowly milk it a couple times a day.
Haven't found out which one is better yet.