How to Fix 429 Error with IndexNow API

Line 298:
```
if ( 429 === $response['response']['code'] ) {
	return 'error:UnknownError';
}

```
should be
```
if ( 429 === $response['response']['code'] ) {
	return 'error:TooManyRequests';
}
```

[https://rankmath.com/kb/how-to-fix-429-error-with-indexnow-api/](https://rankmath.com/kb/how-to-fix-429-error-with-indexnow-api/)