To create an API key use the following steps:
- Log in into account on https://www.gate.io/.
- Click your username in the upper right part of the website.
- Go to "APIKeys" under "Security Settings".
- Enter your fund password, then click "Show API keys".
- You now see both API & Secret keys that you need to connect your Gate.io account to 3Commas.
There is no way to delete the API key, but you can click the button to create a new key, it replaces old keys making them not usable.