prepareHeadersAndTags example

$payload['cc'] = $this->stringifyAddresses($emails);
        }
        if ($emails = $email->getBcc()) {
            $payload['bcc'] = $this->stringifyAddresses($emails);
        }
        if ($email->getTextBody()) {
            $payload['textContent'] = $email->getTextBody();
        }
        if ($email->getHtmlBody()) {
            $payload['htmlContent'] = $email->getHtmlBody();
        }
        if ($headersAndTags = $this->prepareHeadersAndTags($email->getHeaders())) {
            $payload = array_merge($payload, $headersAndTags);
        }

        return $payload;
    }

    private function prepareAttachments(Email $email): array
    {
        $attachments = [];
        foreach ($email->getAttachments() as $attachment) {
            $headers = $attachment->getPreparedHeaders();
            

$payload['cc'] = $this->formatAddresses($emails);
        }
        if ($emails = $email->getBcc()) {
            $payload['bcc'] = $this->formatAddresses($emails);
        }
        if ($email->getTextBody()) {
            $payload['textContent'] = $email->getTextBody();
        }
        if ($email->getHtmlBody()) {
            $payload['htmlContent'] = $email->getHtmlBody();
        }
        if ($headersAndTags = $this->prepareHeadersAndTags($email->getHeaders())) {
            $payload = array_merge($payload, $headersAndTags);
        }

        return $payload;
    }

    private function prepareAttachments(Email $email): array
    {
        $attachments = [];
        foreach ($email->getAttachments() as $attachment) {
            $headers = $attachment->getPreparedHeaders();