docs: def post(self, endpoint, data):
          """
          Executes the HTTP POST request
  
          :param endpoint: string indicating the URL component to call
          :param data: the data to submit
          :return: the dumped JSON response content
          """
          headers = {
              "Content-Type": "application/json",
              "Accept": "application/json",
              "x-standardize-only": "true" if self.standardize else "false",
              "x-include-invalid": "true" if self.invalid else "false",
              "x-accept-keypair": "true" if self.accept_keypair else "false",
          }
          if not self.logging:
              headers["x-suppress-logging"] = "true"
  
          params = {"auth-id": self.auth_id, "auth-token": self.auth_token}
          url = self.BASE_URL + endpoint
          response = self.session.post(
              url,
              json.dumps(stringify(data)),
              params=params,
              headers=headers,
              timeout=self.timeout,
          )
          if response.status_code == 200:
              return response.json()
  
          raise ERROR_CODES.get(response.status_code, SmartyStreetsError)