DeepL Translation Channel:

This channel is unavailable for purchase and registration within China. If you already have a paid account, you can enter your API key into the software -- DeepL.

Leave the API field blank; only fill in the key.

Notes:

Most AI translation channels may limit the number of requests per minute. If an error message indicates exceeding the request frequency during use, you can set a number of seconds through the software's Menu -- Tools/Options -- Advanced Options -- Translation Pause Time, such as 30, meaning that after each translation, wait 30 seconds before the next translation to avoid exceeding the limit and causing errors.