@collectifission Well, all you need is to go to https://www.deepl.com/pro-api?cta=header-pro-api or https://portal.libretranslate.com/ and get an API key.
After that you just need to email me API key and requesting me to add it to configuration of your server.
Until I have the automation in place to do this via the web interface that is the best I can do.