Returns the current active VAPID public key that browsers should use when subscribing to push notifications. This key is needed to establish the web push subscription.
Current VAPID public key
Base64URL-encoded VAPID public key
"BNcRdreALRFXTkOOUHK1EtK2wtaz5Ry4YfYCA_0QTpQtUbVlUK3qW_HkkDQ3CskBSRU481zCtgwtR_jYDg9gNqk"