code: public OvhItem cart_cartId_dns_POST(String cartId, String duration, String planCode, String pricingMode, Long quantity) throws IOException {
  		String qPath = "/order/cart/{cartId}/dns";
  		StringBuilder sb = path(qPath, cartId);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "duration", duration);
  		addBody(o, "planCode", planCode);
  		addBody(o, "pricingMode", pricingMode);
  		addBody(o, "quantity", quantity);
  		String resp = execN(qPath, "POST", sb.toString(), o);
  		return convertTo(resp, OvhItem.class);
  	}
docs: Post a new DNS zone item in your cart
  
  REST: POST /order/cart/{cartId}/dns
  @param cartId [required] Cart identifier
  @param planCode [required] Identifier of a DNS zone offer
  @param duration [required] Duration selected for the purchase of the product
  @param pricingMode [required] Pricing mode selected for the purchase of the product
  @param quantity [required] Quantity of product desired