如何使用firebase的Refresh标记

What is the expiry time of refresh token? Can I get new token if used with refresh token. If yes Is there any time limit for refresh token .

Firebase Authentication uses two tokens:

• a long-lived/permanent refresh token that identifies the user.
• a short-lived ID token that grants the user access to backend services.

The refresh token doesn't expire.

The ID token by default expires hourly. If you mint a custom token you can set a custom expiration, which can never be longer than an hour.