[API] Invalid API key or access token

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Hello.    I have a problem, OAuth gets access_token will receive "[API] Invalid API key or access token (unrecognized login or wrong password)" after two days. I did not specify the access mode because the default value is indicated on the official website. Is the offline access mode, the following is the request address: https://{domain}/admin/oauth/access_token.json?client_id={client_id}&client_secret={client_secret}&code={code} What do I need to configure? In addition, is there an API to refresh the access_token to extend the access time of the access_token. Thank you.