Support

We're here to help you get Known Caller running smoothly. Start with the guides below, or reach out directly.

Contact us

Email hello@knowncaller.app with your site URL, WordPress/WooCommerce versions, and a description of the issue. Include screenshots if helpful.

We aim to respond within 2 business days. Paid license holders receive priority support once the product is available on the WooCommerce Marketplace.

Documentation

Frequently asked questions

What is CardDAV?
CardDAV is an industry-standard protocol for syncing contact information. iPhones, iPads, Macs, and many Android apps (like DAVx⁵) support it natively — the same technology behind iCloud and Google Contacts sync.
Does Known Caller send my customer data to your servers?
No. The plugin runs entirely on your WordPress site. CardDAV traffic goes directly from your server to devices you configure. We receive no customer data, and the plugin includes no telemetry or tracking.
Do I need WooCommerce?
Yes. Known Caller for WooCommerce requires WooCommerce to be installed and active. It reads customer records from your WooCommerce database.
Is HTTPS required?
Yes. WordPress Application Passwords require HTTPS, and most CardDAV clients refuse to connect over plain HTTP. HTTPS is enforced by default in the plugin settings.
What is an Application Password?
Application Passwords are special credentials you create in WordPress (Users → Profile → Application Passwords). They let CardDAV clients authenticate without using your main WordPress login password. You can revoke them individually at any time.
Can I edit contacts from my phone?
Not in version 1.0. The plugin is read-only for safety — your phone can view synced customers but cannot create, edit, or delete them through CardDAV.
How many customers can I sync?
There is no hard limit. The plugin uses incremental sync (only changed contacts are updated) and has been tested with large customer lists.
Will this slow down my website?
No. CardDAV requests are handled on a separate endpoint and do not affect normal page loads or checkout performance.

Troubleshooting

CardDAV client shows "authentication failed" or 401

  1. Confirm you are using an Application Password, not your WordPress login password.
  2. Check that the username matches your WordPress account exactly.
  3. Ensure your site uses HTTPS.
  4. Verify the user has manage_woocommerce capability.
  5. Try creating a fresh Application Password and updating the client.

Client cannot connect / connection refused

  1. Confirm the plugin is activated and the CardDAV server is enabled in WooCommerce → CardDAV Settings.
  2. Check that your site is reachable at https://your-site.com/carddav/
  3. If you use a security plugin or firewall, allow CardDAV methods (PROPFIND, REPORT, GET, OPTIONS).
  4. Some hosts block WebDAV/CardDAV — contact your host if the endpoint returns 403 or 404.

Contacts not appearing or out of date

  1. Open your CardDAV client and trigger a manual sync.
  2. Confirm WooCommerce has customers with phone numbers or email addresses.
  3. Check WooCommerce → CardDAV Settings for the customer count.
  4. Clear the plugin cache in Advanced settings if contacts were recently updated.

Too many requests / 429 error

  1. You may have hit the rate limit after repeated failed login attempts. Wait a minute and try again.
  2. Adjust rate limiting in WooCommerce → CardDAV Settings → Security if needed.

iOS profile will not install

  1. Download the profile on the device itself (or AirDrop/email it to the phone).
  2. Go to Settings → General → VPN & Device Management to install the profile.
  3. If your site uses a self-signed certificate, iOS may reject the connection — use a valid SSL certificate.

Still stuck?

Email hello@knowncaller.app and we'll help you figure it out. Please include:

  • Your WordPress and WooCommerce version numbers
  • The device and CardDAV client you are using (iPhone, DAVx⁵, etc.)
  • What you expected vs. what actually happened
  • Any error messages from the CardDAV client or WordPress