By default, the OAuth 2 token that is generated in an Apigility app expires in 1 hour. Upon expiry, the client is expected to use the refresh token to get a new access token.

You can see this when you authenticate via a POST to /oauth as you get this response back:

{
    "access_token": "3812aaea7640a2567c66e21e2587450821103552",
    "expires_in": 3600,
    "token_type": "Bearer",
    "scope": null,
    "refresh_token": "72d5df08c971526a4ba7c83ec2a7b92d82d9715b"
}

If you need longer than 1 hour, then simply add this top level configuration setting:

    'zf-oauth2' => [
        'access_lifetime' => 7200,
    ],

The access_lifetime key controls the expiry time and is in seconds, so in this case I’ve set it to 2 hours.

Source: AKRABAT