diff --git a/quickstart.php b/quickstart.php
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+<?php
+
+///////////////////////////////////////
+//   CONFIGURATION OF ACCOUNT DATA   //
+///////////////////////////////////////
+
+// To run, configure the account data in this block and remove / comment out
+// the following line with the exit statement
+// DO NOT SERVE THIS SCRIPT VIA WEBSERVER
+echo "Please configure first - exiting\n"; exit(1);
+
+const DISCOVERY_URI = "example.com";
+const USERNAME = "myUserName@example.com";
+
+// Note: for providers using 2-factor authentication (common today, e.g. Apple iCloud,
+// Google, Nextcloud if 2FA enabled by user), you need to provide an application-specific
+// password here, not your account password. You can typically create such
+// application-specific passwords in the account settings of your provider.
+const PASSWORD = "theSecretPassword";
+
+///////////////////////////////////////
+// END CONFIGURATION OF ACCOUNT DATA //
+///////////////////////////////////////
+
+require 'vendor/autoload.php';
+
+use MStilkerich\CardDavClient\{Account, AddressbookCollection, Config};
+use MStilkerich\CardDavClient\Services\{Discovery, Sync, SyncHandler};
+
+use Psr\Log\{AbstractLogger, NullLogger, LogLevel};
+use Sabre\VObject\Component\VCard;
+
+// This is just a sample logger for demo purposes. You can use any PSR-3 compliant logger,
+// there are many implementations available (e.g. monolog)
+class StdoutLogger extends AbstractLogger
+{
+    public function log($level, $message, array $context = array())
+    {
+        if ($level !== LogLevel::DEBUG) {
+            $ctx = empty($context) ? "" : json_encode($context);
+            echo $message . $ctx . "\n";
+        }
+    }
+}
+
+class EchoSyncHandler implements SyncHandler
+{
+    public function addressObjectChanged(string $uri, string $etag, ?VCard $card): void
+    {
+        if (isset($card)) {
+            $fn = $card->FN ?? "<no name>";
+            echo "   +++ Changed or new card $uri (ETag $etag): $fn\n";
+        } else {
+            echo "   +++ Changed or new card $uri (ETag $etag): Error: failed to retrieve/parse card's address data\n";
+        }
+    }
+
+    public function addressObjectDeleted(string $uri): void
+    {
+        echo "   --- Deleted Card $uri\n";
+    }
+
+    public function getExistingVCardETags(): array
+    {
+        return [];
+    }
+
+    public function finalizeSync(): void
+    {
+    }
+}
+
+$log = new StdoutLogger();
+$httplog = new NullLogger(); // parameter could simply be omitted for the same effect
+
+// Initialize the library. Currently, only objects for logging need to be provided, which are two optional logger
+// objects implementing the PSR-3 logger interface. The first object logs the log messages of the library itself, the
+// second can be used to log the HTTP traffic. If no logger is given, no log output will be created. For that, simply
+// call Config::init() and the library will internally use NullLogger objects.
+Config::init($log, $httplog);
+
+// Now create an Account object that contains credentials and discovery information
+$account = new Account(DISCOVERY_URI, USERNAME, PASSWORD);
+
+// Discover the addressbooks for that account
+try {
+    $log->notice("Attempting discovery of addressbooks");
+
+    $discover = new Discovery();
+    $abooks = $discover->discoverAddressbooks($account);
+} catch (\Exception $e) {
+    $log->error("!!! Error during addressbook discovery: " . $e->getMessage());
+    exit(1);
+}
+
+$log->notice(">>> " . count($abooks) . " addressbooks discovered");
+foreach ($abooks as $abook) {
+    $log->info(">>> - $abook");
+}
+
+if (count($abooks) <= 0) {
+    $log->warning("Cannot proceed because no addressbooks were found - exiting");
+    exit(0);
+}
+//////////////////////////////////////////////////////////
+// THE FOLLOWING SHOWS HOW TO PERFORM A SYNCHRONIZATION //
+//////////////////////////////////////////////////////////
+$abook = $abooks[0];
+$synchandler = new EchoSyncHandler();
+$syncmgr = new Sync();
+
+// initial sync - we don't have a sync-token yet
+$log->notice("Performing initial sync");
+$lastSyncToken = $syncmgr->synchronize($abook, $synchandler, [ "FN" ], "");
+$log->notice(">>> Initial Sync completed, new sync token is $lastSyncToken");
+
+// every subsequent sync would be passed the sync-token returned by the previous sync
+// there most certainly won't be any changes to the preceding one at this point and we
+// can expect the same sync-token be returned again
+$log->notice("Performing followup sync");
+$lastSyncToken = $syncmgr->synchronize($abook, $synchandler, [ "FN" ], $lastSyncToken);
+$log->notice(">>> Re-Sync completed, new sync token is $lastSyncToken");
+
+//////////////////////////////////////////////////////////////
+// THE FOLLOWING SHOWS HOW TO PERFORM CHANGES ON THE SERVER //
+//////////////////////////////////////////////////////////////
+
+
+// First, we want to insert a new card, so we create a fresh one
+// See https://sabre.io/vobject/vcard/ on how to work with Sabre VCards
+// CardDAV VCards require a UID property, which the carddavclient library will
+// generate and insert automatically upon storing a new card lacking this property
+
+try {
+    $vcard =  new VCard([
+        'FN'  => 'John Doe',
+        'N'   => ['Doe', 'John', '', '', ''],
+    ]);
+
+
+    $log->notice("Attempting to create a new card on the server");
+    [ 'uri' => $cardUri, 'etag' => $cardETag ] = $abook->createCard($vcard);
+    $log->notice(">>> New card created at $cardUri with ETag $cardETag");
+
+    // now a sync should return that card as well - lets see!
+    $log->notice("Performing followup sync");
+    $lastSyncToken = $syncmgr->synchronize($abook, $synchandler, [ "FN" ], $lastSyncToken);
+    $log->notice(">>> Re-Sync completed, new sync token is $lastSyncToken");
+
+    // add an EMAIL address to the card and update the card on the server
+    $vcard->add(
+        'EMAIL',
+        'johndoe@example.org',
+        [
+            'type' => ['home'],
+            'pref' => 1,
+        ]
+    );
+
+    // we pass the ETag of our local copy of the card to updateCard. This
+    // will make the update operation fail if the card has changed on the
+    // server since we fetched our local copy
+    $log->notice("Attempting to update the previously created card at $cardUri");
+    $cardETag = $abook->updateCard($cardUri, $vcard, $cardETag);
+    $log->notice(">>> Card updated, new ETag: $cardETag");
+
+    // again, a sync should report that the card was updated
+    $log->notice("Performing followup sync");
+    $lastSyncToken = $syncmgr->synchronize($abook, $synchandler, [ "FN" ], $lastSyncToken);
+    $log->notice(">>> Re-Sync completed, new sync token is $lastSyncToken");
+
+    // finally, delete the card
+    $log->notice("Deleting card at $cardUri");
+    $abook->deleteCard($cardUri);
+    // now, the sync should report the card was deleted
+    $log->notice("Performing followup sync");
+    $lastSyncToken = $syncmgr->synchronize($abook, $synchandler, [ "FN" ], $lastSyncToken);
+    $log->notice(">>> Re-Sync completed, new sync token is $lastSyncToken");
+
+    $log->notice("All done, good bye");
+} catch (\Exception $e) {
+    $log->error("Error while making changes to the addressbook: " . $e->getMessage());
+    $log->error("Manual cleanup (deletion of the John Doe card) may be needed");
+
+    // do one final attempt to delete the card
+    try {
+        if (isset($cardUri)) {
+            $abook->deleteCard($cardUri);
+        }
+    } catch (\Exception $e) {
+    }
+
+    exit(1);
+}
+
+// vim: ts=4:sw=4:expandtab:fenc=utf8:ff=unix:tw=120