Coinbase uses an optional security feature of OAuth2 called refresh tokens, if the scope offline_access was requested in the authorize (oauth2/auth) request. When you first authenticate, your app is given an access_token and a refresh_token. The access token authenticates all your requests; but the access token expires in one hour. Once expired, you must use the refresh token to obtain a new access token and a new refresh token. The refresh token expires after 1.5 years; and it can only be exchanged once for a new set of access and refresh tokens. If you try to make a call with an expired access or refresh token, a 401 response is returned.
TokensUse the refresh token to request a new access token and a new refresh token:
  • Access tokens expire in one hour.
  • Refresh tokens expire after 1.5 years and can only be exchanged once.
This process adds some complexity for Coinbase App integrations, but provides an valuable layer of security since a compromised access token is automatically revoked after one hour.

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Refreshing Access & Refresh Tokens

To get a new access token, you must send a POST request to /oauth2/token with your refresh_token and change the grant_type to refresh_token.
There were changes to OAuth2 on March 27, 2024.
The code and redirect_uri parameters are not required for this request. 
curl https://login.coinbase.com/oauth2/token \
  -X POST \
  -d 'grant_type=refresh_token&
      client_id=YOUR_CLIENT_ID&
      client_secret=YOUR_CLIENT_SECRET&
      refresh_token=REFRESH_TOKEN'
The expected result is a response containing the access token, as before: 
{
  "access_token": "...",
  "token_type": "bearer",
  "expires_in": 3600,
  "refresh_token": "...",
  "scope": "all"
}
If you are using an OAuth2 library that supports refresh tokens, the library automatically takes care of these details.

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Revoking an Access Token

Access tokens can be revoked manually if you want to disconnect your application’s access to the user’s account. Revoking can also be used to implement a log-out feature. You must supply the current access token twice, once to revoke it, and another to authenticate the request (either containing access_token parameter or Authentication header with bearer token). 200 OK is returned for both successful and unsuccessful requests. 
curl https://login.coinbase.com/oauth2/revoke \
  -X POST \
  -d 'token=ACCESS_TOKEN&
      client_id=YOUR_CLIENT_ID&
      client_secret=YOUR_CLIENT_SECRET'
  -H 'Authorization: Bearer 6915ab99857fec1e6f2f6c078583756d0c09d7207750baea28dfbc3d4b0f2cb80'