code: public ArrayList<Long> cart_cartId_item_itemId_configuration_GET(String cartId, Long itemId, String label) throws IOException {
  		String qPath = "/order/cart/{cartId}/item/{itemId}/configuration";
  		StringBuilder sb = path(qPath, cartId, itemId);
  		query(sb, "label", label);
  		String resp = execN(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, t5);
  	}
docs: Retrieve all configuration item of the cart item
  
  REST: GET /order/cart/{cartId}/item/{itemId}/configuration
  @param cartId [required] Cart identifier
  @param itemId [required] Product item identifier
  @param label [required] Filter the value of label property (=)