def validate_token(access_token)
      validator = Fridge.configuration.validator
      validator.call(access_token) && access_token
    rescue
      false
    end
def validate_token(access_token)
      validator = Fridge.configuration.validator
      validator.call(access_token) && access_token
    rescue
      false
    end
Validates token, and returns the token, or nil