After using admin ChangePackage getting blank with no errors

[Alrex82]

here's a before and after shot of using change package button

 and hers the function:

function taptacarte_ChangePassword( $params ){
    try {
        $data = json_encode(array(
            'email' => $params['clientsdetails']['email'],
            'subscriptionid' => $params['subscriptionid'],
            ));
        $url = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';
        $cURLConnection = curl_init($url);
        curl_setopt($cURLConnection, CURLOPT_POSTFIELDS, $data);
        curl_setopt($cURLConnection, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($cURLConnection, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json',
            'Accept: Header-Value',
            'Authorization: Bearer XXXXXXXXXXXXXXXXXX',
            ));
        $apiResponse = curl_exec($cURLConnection);
        curl_close($cURLConnection);
        
        $json = json_decode($apiResponse);
        if($json->user_pass == "error"){
            throw new Exception('Error from server');
        }else{
            $params['model']->serviceProperties->save(['Password' => $json->user_pass]);
        }
     } catch (Exception $e) {
        logModuleCall(
            'taptacarte',
            __FUNCTION__,
            $params,
            $e->getMessage(),
            $e->getTraceAsString()
        );
        return $e->getMessage();
    }
    return 'success';
}