class.phpmaileroauthgoogle.php

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<?php
class PHPMailerOAuthGoogle
{
    private $oauthUserEmail = '';
    private $oauthRefreshToken = '';
    private $oauthClientId = '';
    private $oauthClientSecret = '';

    public function __construct(
        $UserEmail,
        $ClientSecret,
        $ClientId,
        $RefreshToken
    ) {
        $this->oauthClientId = $ClientId;
        $this->oauthClientSecret = $ClientSecret;
        $this->oauthRefreshToken = $RefreshToken;
        $this->oauthUserEmail = $UserEmail;
    }

    private function getProvider()
    {
        return new League\OAuth2\Client\Provider\Google([
            'clientId' => $this->oauthClientId,
            'clientSecret' => $this->oauthClientSecret
        ]);
    }

    private function getGrant()
    {
        return new \League\OAuth2\Client\Grant\RefreshToken();
    }

    private function getToken()
    {
        $provider = $this->getProvider();
        $grant = $this->getGrant();
        return $provider->getAccessToken($grant, ['refresh_token' => $this->oauthRefreshToken]);
    }

    public function getOauth64()
    {
        $token = $this->getToken();
        return base64_encode("user=" . $this->oauthUserEmail . "\001auth=Bearer " . $token . "\001\001");
    }
}