The package open right now is the 1 user or private slot, where you get full access to a Moonshot account topped up with API credits according to the plan. The Moonshot account is shared with other JoinBareng users for a monthly period, and login credentials are handed over once payment is verified. Because this is a shared account, do not change the Moonshot password or email, and do not log out other devices that are using the same account, as that can lock you out of your slot.
Group packages that split the cost across 4 people will be available later, so for now you get the private slot ready for single use. API credits are pay-as-you-go, so the more you call Moonshot endpoints using the API key, the faster the balance drops. Always monitor usage from your Moonshot dashboard so you do not run out mid production.
If the group is not full yet, per the group buy flow the group package stays inactive until all slots are filled. That is why the available package right now is the private slot, which activates immediately after QRIS payment clears. Once the group package opens, JoinBareng will announce it on the product page and you can switch to the group option anytime if it works better for your usage.