Connect a provider

• Google Contacts — OAuth via Google
• Microsoft / Outlook — OAuth via Microsoft
• iCloud Contacts — CardDAV with Apple ID + app-specific password

Go to Settings → Integrations and click Connect next to the provider. Follow the authentication steps. Once connected, Poncdash performs an initial sync and continues syncing in the background.

Apple requires an app-specific password for CardDAV access. Generate one at appleid.apple.com under Security → App-Specific Passwords. Enter your Apple ID and that password in the iCloud auth form.