Error status code 500 during install or reinstall (App Store Rejection)

[policenauts1]

I searched the forums and can't find a single instance of anyone else getting this error, has anyone ever experienced this? 

FWIW I'm using the Google Apps Scripts OAuth2 library which I believe in certain instances or browser configurations can throw a 500 error, but I've tested it at this point extensively on both Chrome and Safari, and in my own logs the automated Shopify store "appstoretest5" successfully made it through my OAuth (successfully exchanged auth code for access token) AND also created a charge_id with the billing api. 

Is the 500 error code on the Shopify side or my end?

Any guidance would be appreciated!

[policenauts1]

Please disregard, I think this is on my end.