wp-includes/PHPMailer/OAuth.php:111Get a new AccessToken.
League\OAuth2\Client\Token\AccessToken protected function getToken() { return $this->provider->getAccessToken( $this->getGrant(), ['refresh_token' => $this->oauthRefreshToken] ); }Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/PHPMailer/OAuth.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.