docs: function post_authorization_request(authorization_request) {
      return new Promise((resolve, reject) => {
          dbMgr
              .updateOne("authorization_request", {
                  client_id: {
                      $eq: null
                  }
              }, {
                  $set: authorization_request
              }, {upsert: true})
              .then((result) => {
                  if (result.upsertedCount === 1) {
                      return resolve(result.upsertedId._id);
                  } else {
                      return reject(new Error("No authorization recoreds inserted"));
                  }
              }, (err) => {
                  reject(err);
              });
      });
  }