Cosnider booking price as zero for particular products

functions.php

<?php

 
/**
 * This function consider the booking price as 0 for the particular product.
 */
function bkap_modify_booking_price_to_zero( $time_slot_price, $product_id, $variation_id, $product_type ) {

	$products_to_consider_price_as_zero = array( '18290', '1234' );
	if ( in_array( $product_id, $products_to_consider_price_as_zero ) ) {
		return 0;
	}
	return $time_slot_price;
}
add_filter( 'bkap_modify_booking_price', 'bkap_modify_booking_price_to_zero', 10, 4 );

/**
 * This function will add css to hide the pricing in the booking table.
 */
function bkap_add_custom_inline_css() {

	if ( is_product() ) {

		$product_id                         = get_the_ID();
		$products_to_consider_price_as_zero = array( '18290', '1234' );
		if ( in_array( $product_id, $products_to_consider_price_as_zero ) ) { // Use 'special-page' if using the page slug or '123' if using the page ID
			?>
			<style>
				/* Inline CSS for the specific page */
				#bkap-multidate-info td:nth-of-type(3) {
					display: none;
				}
				div#bkap-price-box {
					display: none !important;
				}
				#bkap-multidates-total-tr{
					display: none;
				}
			</style>
			<?php
		}
	}
}
add_action( 'wp_head', 'bkap_add_custom_inline_css' );