If travelling on domestic flights,
- foreigners need to show their official printed vaccination certificate indicating
base vaccination + 3rd booster
(ours was the EU Dutch / English sheet with printout of QR and data)
https://coronacheck.nl/en/print/

- at entry departure terminal building
- at checkin counter of the airline

! No need to show EHAC aslong as you have paperproof in English of vaccination +1 booster
! No need to show health insurance

For locals it is their Peduli Lindungi app only

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for those that want peace of mind and install the Peduli Lindungi app anyway
the trick with the Peduli Lindungi app is
- first : register at their site https://www.pedulilindungi.id
(Choose english in upper right right corner where it says ID next to login / register)
1 choose register by email [NOT MOBILE NR = won't work unless you got an Indonesian NR]
2 you need your passport details
3 verification codes sent to your email
- second : after registration input and log in using the app
1 verifications sent to your email
* the IOS app seems to be fully in English, the Android app yoyos between English & Indonesian

! No need to upload or fill other info for foreigners

If you enter a mall or something (in Bali)
- locals scan the QR and register with Peduli Lindungi app
- foreigners can just show their international vaccination certificate