showCountdown property
Whether the countdown timer (and its eventual "code expired" view) are shown at all.
When false, the widget never renders the "Code valid for M:SS" line
below the digits nor the expired view with the onExpiredGoBack
button — the field stays in its active "type the numberOfDigits
characters" state forever (the wrong-code and verification-failed
errors are still shown as usual). countdownStartDateTime and
countdownDuration are ignored in this case. Defaults to true.
Implementation
final bool showCountdown;