Odoo

Login as the user for whom you want to generate an API key.

Click on the profile icon at the top right and choose My Profile.

Go to the Account Security tab, scrolls down to the API KEYS section and click New API Key:

Confirm your identity when requested by re-entering your password.

Enter a name for the key, and choose the validity (e.g. Persistent key).

Click Generate key:

Copy the API key to the clipboard and click Done!