JSON Composition for sending:

{
	*"auth" : key obtained in get/auth method
	*,"order" :
		{
			"id" : unique order identification returned by put/order
			,"invoice" : base 64 of the XML covering the order
		}
}

Returns with:
{
	"code" : integer
	,"message" : text
}

Code:
200: XML uploaded successfully
404: Order number not found
403: Order already has an XML and overwriting is not allowed
500: Invalid auth
501: Nfe XML does not contain the authorization TAG (as per SEFAZ legislation, cStat=100)

Message:
Additional information about the error is not a mandatory field in the return.