Everything you registered, in one place: rotate a key the moment it leaks, retire a service you are done with, keep a contact address current. Pairings and domain verification ride along through a rotation untouched.
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A service's API key appears exactly twice in its life — when you register, and when you rotate. Everything on this page works from the service's public ID, so the key itself stays where you put it.
The previous key stopped working the moment this one was made. Put it in your server's configuration, then close this.