As an alternative to registering a dedicated Tapkey ID, you can also use your Google account to login to the Tapkey app. This delegation of authentication is widely used in many online platform as a secure and convenient way to authenticate with an existing digital identity.
When signing in to the Tapkey app on Android, you are even suggested with available Google accounts stored on your phone, given you provided your Google accounts' credentials when initially setting up your Android device. This is a very convenient and secure procedure as you don’t have to re-enter your password (which also eliminates phishing attacks or someone looking over your shoulder).