## Get put/call option chain

```javascript
let UpstoxClient = require('upstox-js-sdk');
let defaultClient = UpstoxClient.ApiClient.instance;
var OAUTH2 = defaultClient.authentications['OAUTH2'];
OAUTH2.accessToken = "{your_access_token}";
let apiInstance = new UpstoxClient.OptionsApi();
apiInstance.getPutCallOptionChain("NSE_INDEX|Nifty 50","2024-10-31",(error, data, response) => {
    if (error) {
      console.error(error);
    } else {
      console.log('API called successfully. Returned data: ' + JSON.stringify(data));
    }
  });
```