OGOship has published an open API for developers.
The API description can be found @ API server.
You can update products and orders trought the API.
The API uses oauth2 token for authentication. Currently it is possible to use a Resource owner password based flow to generate a token. The token is valid for 1.5 hours and must be refreshed after that time. The refresh token is valid for 2 weeks and for one refresh. The new refresh token is returned after each refresh.