docs: def with_mfa(self, mfa_token):
          """Set the MFA token for the next request.
          `mfa_token`s are only good for one request. Use this method to chain into
          the protected action you want to perform.
  
          Note: Only useful for Application authentication.
          Usage:
            account.with_mfa(application.totp.now()).pay(...)
  
          Args:
            mfa_token (str/function, optional): TOTP token for the Application
              OR a callable/function which will generate such a token when called.
  
          Returns:
            self
          """
          if hasattr(mfa_token, '__call__'): # callable() is unsupported by 3.1 and 3.2
              self.context.mfa_token = mfa_token.__call__()
          else:
              self.context.mfa_token = mfa_token
          return self