functions.php

<?php 

if( class_exists('YITH_WC_Points_Rewards_Frontend')){
	add_filter('ywpar_get_product_point_earned', 'ywpar_get_product_point_earned_gift_card', 10, 2 );
	function ywpar_get_product_point_earned_gift_card( $points, $product ){
		if( $product->is_type('gift-card')){
			$points = 0;
		}
		return $points;
	}

	add_filter('ywpar_calculate_rewards_discount_item_price', 'ywpar_calculate_rewards_discount_item_price', 10, 3);
	function ywpar_calculate_rewards_discount_item_price( $price, $value, $product_id){
		$product = wc_get_product( $product_id );
		if( $product->is_type('gift-card')){
			$price = 0;
		}
		return $price;
	}
}