What is the PIN of my Bitwala debit card used for? 13 September 2018 09:45 The PIN of your Bitwala debit card is used to withdraw cash at ATMs and to authorise payments at physical points of sale. Related articles How long does card delivery take? Where can the Bitwala debit card be used? How to change the PIN of my Bitwala debit card? Do you offer virtual cards? My card was lost or stolen - what now?