JSON Composition for sending:

{
	*"auth" : key obtained in get/auth method
}

Returns with:
{
	"code" : integer
	,"stock" :
		{
			"sku" : text
			,"disponivel" : integer - quantity available in WMS
			,"solicitado" : integer - summed quantity in unfulfilled orders
			,"pedidos" : integer - quantity of orders waiting for balance
		}
}

Code:
200: request fulfilled
404: no products with stock shortage
500: invalid auth