Clover Go <--> REST API connect for Orders and Line Items

I've been working for a while trying to get Clover working with a custom POS I've written for a client. Originally, I was working with a Clover Station. After a lot of forum discussion ( here) it was suggested that I could use a combination of Clover Go and the REST API to do what I wanted. @Raymond Lee ( comment): Yes, Clover Go would be a suitable alternative, since if you would be using your own Android device, you can side-load your app to the Android device. Your app can then use the Clover Go device to take payments, and use REST API calls to create Orders.

I got my hands on a Clover Go Dev Kit. I've got a test application that successfully...

1. Runs OAuth to get an access_token, use that access token to make an ICloverGoConnectorListener(), connect to the Go via bluetooth, create a SaleRequest and run a credit card transaction.
2. I can use that access_token to do REST API calls to create an Order, add Line Items and get back an Order ID.

What I can't do is connect 1 & 2. The Clover Go SaleRequest only takes an amount and an ExternalPaymentID (random string). There is no way to create line items - the receipt just shows "item" and the amount ( example). I've dug through the Javasdocs ( here) and can't find how to connect a REST API created OrderID to a Clover Go SaleRequest.

Honestly, I can get away with just having the Clover Go SaleRequest generated Order have the single line item, as long as I can update the description from "item" to something else.

Any pointers?