Tiny requests API key

[vitaleg]

Starting in early 2024, all editors on our cloud platform will be required to have a valid API key. Without a valid API key, your editor will transition to read-only mode, limiting your ability to make changes.

Affected users will receive a notification in their editor. If you receive this notification, please contact the Administrator for your application/site. Admins will need to get a valid API key and paste it into the code to continue using TinyMCE.

Source

I tried to find the API key environment variable, but couldn't find it.