Add origin header on newsletter POST /singnup request

	private function signupForNewsletter(string $userEmail, array $listIds, string $userLanguage): void {

		$newsletterApiUrl = $this->config->getSystemValue('newsletter_base_url', '');

		$origin = (!empty($_SERVER['HTTPS']) ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'];

		if (empty($newsletterApiUrl)) {

			return;

		$params_string = json_encode($params);

		$headers = [

			'Content-Type: application/json',

			'Content-Length: ' . strlen($params_string)

			'Content-Length: ' . strlen($params_string),

			'Origin: ' . $origin

		];

		$this->curl->post($url, $params, $headers);