code: def subscribe(self, user, verbose=None):
          
          if not self.email_enabled:
              raise EmailNotEnabledError("See settings.EMAIL_ENABLED")
          if not user.email:
              raise UserEmailError(f"User {user}'s email address is not defined.")
          response = requests.post(
              f"{self.api_url}/{self.address}/members",
              auth=("api", self.api_key),
              data={
                  "subscribed": True,
                  "address": user.email,
                  "name": f"{user.first_name} {user.last_name}",
                  "description": f'{user.userprofile.job_title or ""}',
                  "upsert": "yes",
              },
          )
          if verbose:
              sys.stdout.write(
                  f"Subscribing {user.email} to {self.address}. "
                  f"Got response={response.status_code}.\n"
              )
          return response
docs: Returns a response after attempting to subscribe
          a member to the list.