alreadyConsumed property
Indicates weather this token was already consumed.
If this is the first time AppCheck.verifyToken method has seen this token,
this field will contain the value false. The given token will then be
marked as already_consumed for all future invocations of this AppCheck.verifyToken
method for this token.
When this field is true, the caller is attempting to reuse a previously consumed token.
You should take precautions against such a caller; for example, you can take actions such as
rejecting the request or ask the caller to pass additional layers of security checks.
Implementation
final bool? alreadyConsumed;