Can I choose between Visa or Mastercard for my IDR virtual cards?

Unfortunately, you can't pick the payment network for your card.

Starting on 11 July 2023, all virtual cards made for IDR Debit Account and IDR Advance Limit will be under Mastercard. Don't worry, the features for Visa-issued cards will also be available for cards under Mastercard. 

Relevant article: What is the limitation to my Mastercard virtual cards?

What would happen to my existing Visa cards? 

Your existing cards under Visa will continue to remain active and usable until their expiration date.