link-change-specific-product.php

add_action('wp', 'fs_prevent_fkcart_hook', -10);
function fs_prevent_fkcart_hook() {
    
    global $post;
    
    // The product ID you want a specific redirect for
    $matched_id = 8627035;

    if( isset($post->ID) && $post->ID == $matched_id ) {
	if( class_exists('\FKCart\Includes\Front') ) {
		$fk_cart_instance = \FKCart\Includes\Front::get_instance();
        		remove_action( 'wp', [ $fk_cart_instance, 'init_hooks' ] );
}
        
    }
}

add_filter( 'woocommerce_add_to_cart_redirect', 'custom_add_to_cart_redirect' );
function custom_add_to_cart_redirect( $url ) {

    // The product ID you want a specific redirect for
    $matched_id = 8627035; 

    // If product ID matches, modify redirect
    if ( isset( $_POST['add-to-cart'] ) && $matched_id == (int) $_POST['add-to-cart'] ) {            
      $url = 'https://stg-vipcarmountcom-staging.kinsta.cloud/refunds-policy/'; 
    }
	
    // always return a value
    return $url;

}