1. Buy a subscription from deepl.com. Don’t buy the Starter plan which does not support CAT integration.
2. Log on to deepl.com after purchasing and go to ‘account’
3. Find ‘Authentication Key for DeepL API’ and click ‘copy to clipboard’ button.
4. Open GT4T Setup screen (Press Ctrl+Alt+F2 on Windows, Cmd+Option+F2 on Mac), go to API tab. Tick ‘Enable Deepl Pro’ and paste your DeepL API code.
5. You can then buy GT4T slim plan to use with your own deepl subscription. If you use your deepl API with other GT4T char-based plans, the character count will be discounted proportionally.