How to dynamically change the price of the review for particular posts

To change the price of the review for particular posts, add this following snippet to the functions.php file of your theme or your child theme.

add_filter('wppr_price_raw', 'custom_wppr_price_raw', 10, 3);

function custom_wppr_price_raw($price, $id, $model){
	if($id == 9) {
		$price = '$ 9.99';
	}
	if($id == 10) {
		$price = '$ 19.99';
	}
	return $price;
}

This will change the price of the reviews for posts with id 9, and 10.