You can automate your invoicing process by integrating your ERP system with Tradeshift. You can do so via the FTPS and SFTP file transfer protocols, or via API. 

The below video presents an overview of how you can integrate with Tradeshift:

This video details the available file transfer methods available for integrating to Tradeshift:

After you log in to Tradeshift, you will be able to watch the full Tradeshift University course on integrations and managed suppliers, available here.