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    // retrieve personio api token
    $response = wp_remote_post('https://api.personio.de/v1/auth', [
        'headers' => [
            'Accept'       => 'application/json',
            'Content-Type' => 'application/json',
            'X-Company-ID' => $company_id,
        ],
        'body' => \json_encode([
            'client_id'     => $client_id,
            'client_secret' => $client_secret,
        ]),
    ]);

    if (is_wp_error($response)) {
        error_log('Personio Auth API error: ' . $response->get_error_message());

        return;
    }

    $raw_response = wp_remote_retrieve_body( $response );
    $body = \json_decode($raw_response, true);

    if (!$body || !isset($body['data']) || !isset($body['data']['token'])) {
        error_log('Personio Auth API error: Response could not be decoded');

        return;

    }
    $api_token = $body['data']['token'];

    // transform post data

    $data = $record->get( 'fields' );

    $body = [
        'first_name'            => $data['first_name'] ?? '',
        'last_name'             => $data['last_name'] ?? '',
        'email'                 => $data['email'] ?? '',
        'job_position_id'       => $job_position_id,
        'recruiting_channel_id' => $recruiting_channel_id,
        'application_date'      => date('Y-m-d'),
        'message'               => $data['motivation'] ?? '',
        'attributes'            => [
            [
                'id'    => 'custom_attribute_4382494', // id of custom attribute "Telefonnummer"
                'value' => $data['phone'] ?? '',
            ],
        ],
    ];

    // send data to personio

    $response = wp_remote_post('https://api.personio.de/v1/recruiting/applications', [
        'headers' => [
            'Authorization' => \sprintf('Bearer %s', $api_token),
            'Content-Type'  => 'application/json',
            'Accept'        => 'application/json',
            'X-Company-ID'  => $company_id,
        ],
        'body' => \json_encode($body),
    ]);

    if (is_wp_error($response)) {
        error_log('Personio API error: ' . $response->get_error_message());

        return;
    }

    error_log('Personio API response: ' . print_r($response, true));