public async Task <bool> TokenIsValid()
{
var token = await this.secureStorage.Get <string>(StorageConstants.ACCESS_TOKEN);
if (string.IsNullOrEmpty(token))
{
return(false);
}
var expirationString = await this.secureStorage.Get <string>(StorageConstants.EXPIRATION_DATE);
return(TokenUtilities.TokenIsValid(token, expirationString));
}