code: def get_contact(self, msisdn):
          
          response = self.session.post(
              urllib_parse.urljoin(self.api_url, "/v1/contacts"),
              json={"blocking": "wait", "contacts": [msisdn]},
          )
          response.raise_for_status()
          whatsapp_id = response.json()["contacts"][0].get("wa_id")
          if not whatsapp_id:
              self.fire_failed_contact_lookup(msisdn)
          return whatsapp_id
docs: Returns the WhatsApp ID for the given MSISDN