If the 3PL uses shipstation, a convenient way for them to have a native integration would be to add a Fulfil warehouse as a custom store. You can read more about shipstation's custom store option here.
Updated about 4 years ago
All
Reference
If the 3PL uses shipstation, a convenient way for them to have a native integration would be to add a Fulfil warehouse as a custom store. You can read more about shipstation's custom store option here.