Global Dynamic Shipping (global easyship account)

Following this post https://developers.easyship.com/discuss/62af1d6cbb958b0044c9a7fe where you explained how we can dynamically change the source address (via API) for rates and shipments.

The origin_address object doesn't contain the country_alpha2 (string) that the destination_address object contains.

We are using easyship's global account and need to be able to specify the country in the origin_address object.

Please advise how to do this.