[Conditional Shipping & Payments] Creating new conditions that include multiple modifiers

gistfile1.txt

<?php

add_filter( 'woocommerce_csp_conditions', function( $condition_classes ) {
class WC_CSP_Condition_Package_Item_Quantity_Bottles extends WC_CSP_Condition_Package_Item_Quantity {

    public function __construct() {
        parent::__construct();
        $this->id = 'bottles_in_package';
        $this->title = __( 'Bottles Count', 'woocommerce-conditional-shipping-and-payments' );
    }
  }

  $condition_classes[] = 'WC_CSP_Condition_Package_Item_Quantity_Bottles';
  
  return $condition_classes;
} );


add_filter( 'woocommerce_csp_package_item_quantity_count', 'wc_sw_csp_bottles_items_count', 10, 4 );
function wc_sw_csp_bottles_items_count( $total_quantity, $package, $data, $args ) {
  
  $total_quantity = 0;
  if ( 'shipping_methods' === $args[ 'restriction_data' ][ 'restriction_id' ] && 'bottles_in_package' === $data[ 'condition_id' ] ) {

    foreach ( $package[ 'contents' ] as $cart_item_key => $cart_item_data ) {
        $product_id = $cart_item_data[ 'product_id' ];
        $terms = get_the_terms( $product_id, 'product_cat' );
        $terms_slugs = array();
        foreach ( $terms as $term ) {
          $terms_slugs[] = $term->slug;
    }

    if ( in_array( 'wine', $terms_slugs ) ) {
      $total_quantity += $cart_item_data[ 'quantity' ];
}
    }
  }

  return $total_quantity;
}