namespace Microsoft.AspNet.Identity
{
    public class TotpSecurityStampBasedTokenProvider<TUser, TKey> : IUserTokenProvider<TUser, TKey>
        where TUser, class, IUser<TKey>
        where TKey, IEquatable<TKey>
    {
        public virtual Task<string> GetUserModifierAsync(string purpose, UserManager<TUser, TKey> manager, TUser user);
    }
}