DirectAdmin\LetsEncrypt\Lib\Domain::applyCertificates PHP Method

    public function applyCertificates()
    {
        if (defined('CRON')) {
            $domainPath = '/usr/local/directadmin/data/users/' . $this->account->getUsername() . '/domains/' . $this->getDomain();
            file_put_contents($domainPath . '.key', $this->domainKeys->getPrivate());
            chown($domainPath . '.key', 'diradmin');
            chgrp($domainPath . '.key', 'diradmin');
            chmod($domainPath . '.key', 0600);
            file_put_contents($domainPath . '.cert', $this->getCertificate());
            chown($domainPath . '.cert', 'diradmin');
            chgrp($domainPath . '.cert', 'diradmin');
            chmod($domainPath . '.cert', 0600);
            file_put_contents($domainPath . '.cacert', implode("\n", $this->getCertificateAuthorityCertificates()));
            chown($domainPath . '.cacert', 'diradmin');
            chgrp($domainPath . '.cacert', 'diradmin');
            chmod($domainPath . '.cacert', 0600);
            $config = new Config($domainPath . '.conf');
            $config->config('SSLCertificateKeyFile', $domainPath . '.key');
            $config->config('SSLCertificateFile', $domainPath . '.cert');
            $config->config('SSLCACertificateFile', $domainPath . '.cacert');
            $config->config('ssl', 'ON');
        } else {
            $sock = $this->getSocket();
            $sock->set_method('POST');
            $sock->query('/CMD_API_SSL', ['domain' => $this->getDomain(), 'action' => 'save', 'type' => 'paste', 'certificate' => $this->domainKeys->getPrivate() . PHP_EOL . $this->getCertificate(), 'submit' => 'Save']);
            $result = $sock->fetch_parsed_body();
            if ($result['error'] != 0) {
                throw new \Exception('Error while executing first API request: ' . $result['details']);
            }
            $sock->set_method('POST');
            $sock->query('/CMD_API_SSL', ['domain' => $this->getDomain(), 'action' => 'save', 'type' => 'cacert', 'active' => 'yes', 'cacert' => implode("\n", $this->getCertificateAuthorityCertificates()), 'submit' => 'Save']);
            $result = $sock->fetch_parsed_body();
            if ($result['error'] != 0) {
                throw new \Exception('Error while executing second API request: ' . $result['details']);
            }
        }
        return true;
    }

            continue;
        }
        $log->log('Processing domain ' . $domain->getDomain());
        // Check if a renew is required, if everything needs to be checked within 10 days or in the past
        if (strtotime($domain->config('expire')) - time() >= 10 * 86400) {
            $log->log('Domain ' . $domain->getDomain() . ' doesn\'t need a reissue');
            continue;
        }
        try {
            $challenges = new Challenges($domain);
            $challenges->solveChallenge();
            $log->log('Successfully completed challenge for ' . $domain->getDomain());
            $domain->createKeys();
            $domain->requestCertificate(null, $domain->config('subdomains'));
            $log->log('Successfully received certificate from Let\'s Encrypt');
            $domain->applyCertificates();
            $log->log('Successfully applied certificate and CA certificates to DirectAdmin');
            $domain->config('domain', $domain->getDomain());
            $domain->config('subdomains', $domain->getSubdomains());
            $domain->config('status', 'applied to DirectAdmin (renewed)');
            $domain->config('expire', date('Y-m-d', strtotime('+50 days')));
            $log->log('Reissued domain ' . $domain->getDomain() . ' with success.');
        } catch (\Exception $e) {
            $log->error($e->getMessage(), null, false);
        }
    }
}
// Rewrite and restart HTTPD files
$queue = 'action=rewrite&value=httpd' . PHP_EOL;
$queue .= 'action=httpd&value=graceful' . PHP_EOL;
file_put_contents('/usr/local/directadmin/data/task.queue', $queue, FILE_APPEND);