TOPAMI has no separate cart: the selection is built on the game page. You can take several currency packs, a subscription, and one Battle Pass — all go into one order for one account.
How to build a selection
Open a game, add the items you need, and check the total at the bottom. Battle Pass is single-select: choosing another option replaces the previous one.
Checkout
When the selection is ready, continue to checkout. Enter UID, server, and contact email.