This Heroku group plan uses the invitation system, where you will receive an official Heroku invitation sent directly to your registered email address. After you accept the invitation, your account will be automatically linked to the Eco dynos plan managed by the JoinBareng admin. You can start deploying applications right away as if you had a personal Heroku account, but at a more affordable cost because the subscription is shared.
The currently available plan is the 1 user or private plan, where one slot is used by one person. Usage rules: do not change the password or email of the account, and do not log out other active devices, since it would cut off access for other members. The group plan with a maximum of 3 people per group will be opened soon. While the group plan is not yet available, you can still use the 1 user plan that is active now.
If you buy a group plan and the slots are not yet full, the admin will wait until all slots are filled before activating access and sending the invitation to each member's email. Once the group is full and active, the invitation will be sent shortly according to the admin processing queue.