What you need to be aware of; Indonesia take part in Common Reporting Standard (CRS) framework. So Foreign banks and financial groups in participating countries will automatically send your annual summary, The EoY Balance directly to Indonesian tax authorities if you are an Indonesian tax residence.
They are not reporting day to day transaction, but the annual summary/EoY balance could reveal a lot of things such as significant increase in balance, overseas earning from interest, dividend, house sales proceed, etc. This initial evidence might be enough to allow them to summon and quiz the person for an alleged unreported overseas income.
It has been reported previously that they manage to track someone, an Indonesian tax residence renting their properties abroad without reporting it to Indonesian tax authorities and they got summoned.