FIRMultiFactorAssertion
@interface FIRMultiFactorAssertion : NSObject
The base class for asserting ownership of a second factor. This is equivalent to the AuthCredential class. This class is available on iOS only.
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The second factor identifier for this opaque object asserting a second factor.
Declaration
Objective-C
@property (nonatomic, readonly, nonnull) NSString *factorID;