diff --git a/CRM/TwingleCampaign/BAO/CustomField.php b/CRM/TwingleCampaign/BAO/CustomField.php
index dea24f9..174e715 100644
--- a/CRM/TwingleCampaign/BAO/CustomField.php
+++ b/CRM/TwingleCampaign/BAO/CustomField.php
@@ -62,10 +62,10 @@ class CRM_TwingleCampaign_BAO_CustomField {
    *
    * @param bool $upgrade
    * If true: Does not show UF message if custom field already exists
-   *
+   * @returns array Result of custom field creation api call
    * @throws \CiviCRM_API3_Exception
    */
-  public function create(bool $upgrade = false) {
+  public function create(bool $upgrade = FALSE): ?array {
 
     // Check if the field already exists
     $field = civicrm_api3(
@@ -95,6 +95,7 @@ class CRM_TwingleCampaign_BAO_CustomField {
       id: $this->id
       group: $this->custom_group_id"
         );
+        return $this->result;
       }
       // If the field could not get created: log error
       else {
@@ -112,12 +113,17 @@ class CRM_TwingleCampaign_BAO_CustomField {
             $this->result['error_message']");
           CRM_Utils_System::setUFMessage(E::ts("Creation of custom field failed. Find more information in the logs."));
         }
+        return $this->result;
       }
     }
     elseif (!$upgrade) {
       CRM_Utils_System::setUFMessage(E::ts('Creation of custom field \'%1\' failed, because a custom field with that name already exists. Find more information in the logs.', [1 => $this->name]));
       Civi::log()
         ->error("$this->extensionName could not create new custom field \"$this->name\" for group \"$this->custom_group_id\" because a field with that name already exists.");
+      return NULL;
+    }
+    else {
+      return NULL;
     }
   }
 
diff --git a/CRM/TwingleCampaign/Upgrader.php b/CRM/TwingleCampaign/Upgrader.php
index 6cecff9..3d4d94d 100644
--- a/CRM/TwingleCampaign/Upgrader.php
+++ b/CRM/TwingleCampaign/Upgrader.php
@@ -13,13 +13,14 @@ use CRM_TwingleCampaign_ExtensionUtil as E;
  */
 class CRM_TwingleCampaign_Upgrader extends CRM_TwingleCampaign_Upgrader_Base {
 
-  // By convention, functions that look like "function upgrade_NNNN()" are
-  // upgrade tasks. They are executed in order (like Drupal's hook_update_N).
-
   /**
+   * This update function checks whether all custom fields defined in
+   * CRM/TwingleCampaign/resources/campaigns.php exist and creates them if not.
+   * To ensure that all newly created custom fields get filled with data, all
+   * changed campaigns will get pulled from Twingle.
    * @throws \CiviCRM_API3_Exception
    */
-  public function upgrade_01() {
+  public function upgrade_01(): bool {
 
     $campaign_info = require E::path() .
       '/CRM/TwingleCampaign/resources/campaigns.php';
@@ -31,7 +32,7 @@ class CRM_TwingleCampaign_Upgrader extends CRM_TwingleCampaign_Upgrader_Base {
       new CampaignType($campaign_type);
     }
     foreach (CampaignType::getCampaignTypes() as $campaign_type) {
-      $campaign_type->create(true);
+      $campaign_type->create(TRUE);
     }
 
     // Create custom groups
@@ -42,13 +43,61 @@ class CRM_TwingleCampaign_Upgrader extends CRM_TwingleCampaign_Upgrader_Base {
         }
       }
       $cg = new CustomGroup($custom_group);
-      $cg->create(true);
+      $cg->create(TRUE);
     }
 
+    // If new fields get created during the update, set a flag to set all
+    // last_update values of the affected campaigns to "0" and trigger a
+    // synchronization. This ensures that settings on Twingle's side will not
+    // get overwritten with empty values.
+    $updatedCampaignTypes = [];
+
     // Create custom fields
     foreach ($campaign_info['custom_fields'] as $custom_field) {
       $cf = new CustomField($custom_field);
-      $cf->create(true);
+      $result = $cf->create(TRUE);
+
+      if (!empty($result)) {
+        preg_match(
+          '/^Twingle_[a-yA-Z]*/',
+          $cf->getCustomGroupId(),
+          $updatedCampaignTypes[]
+        );
+      }
+    }
+
+    // Filter changed campaign types
+    foreach ($updatedCampaignTypes as $key => $value) {
+      $updatedCampaignTypes[str_replace('_', '', $value[0])]
+        = TRUE;
+      unset($updatedCampaignTypes[$key]);
+    }
+
+    // Pull changed campaigns to fill new created fields with data
+    try {
+      foreach ($updatedCampaignTypes as $key => $value) {
+        if ($value === TRUE) {
+          civicrm_api3(
+            $key,
+            'sync',
+            ['pull' => TRUE]
+          );
+        }
+      }
+    } catch (Exception $e) {
+      Civi::log()->error(
+        E::LONG_NAME .
+        ' could not pull campaigns from Twingle to fill the campaign fields that were created on update.' .
+        $e->getMessage()
+      );
+      CRM_Core_Session::setStatus(
+        E::ts(
+          'Could not pull campaigns from Twingle to fill the campaign fields that were created within this update: %1',
+          [1 => $e->getMessage()]
+        ),
+        E::ts('Scheduled Job'),
+        error
+      );
     }
 
     // Create option values
@@ -124,7 +173,6 @@ class CRM_TwingleCampaign_Upgrader extends CRM_TwingleCampaign_Upgrader_Base {
         E::ts('Scheduled Job'),
         error
       );
-      CRM_Utils_System::setUFMessage(E::ts('Could not create scheduled job "TwingleSync". Your Campaigns will not get synchronized to Twingle.'));
     }
   }
 
diff --git a/api/v3/TwingleEvent/Sync.php b/api/v3/TwingleEvent/Sync.php
index 9de54cb..23a8b88 100644
--- a/api/v3/TwingleEvent/Sync.php
+++ b/api/v3/TwingleEvent/Sync.php
@@ -41,6 +41,13 @@ function _civicrm_api3_twingle_event_Sync_spec(array &$spec) {
     'api.required' => 0,
     'description'  => E::ts('If this is set true, no database change will be made'),
   ];
+  $spec['pull'] = [
+    'name'         => 'pull',
+    'title'        => E::ts('Pull'),
+    'type'         => CRM_Utils_Type::T_BOOLEAN,
+    'api.required' => 0,
+    'description'  => E::ts('If this is set true, the event(s) will be pulled from Twingle and updated locally'),
+  ];
   $spec['twingle_api_key'] = [
     'name'         => 'twingle_api_key',
     'title'        => E::ts('Twingle API key'),
@@ -111,6 +118,10 @@ function civicrm_api3_twingle_event_Sync(array $params): array {
     Civi::cache('long')->set('twinglecampaign_twingle_api', $twingleApi);
   }
 
+  // Set pull flag
+  $pull = (isset($params['pull']) && $params['pull']);
+  unset($params['pull']);
+
   // If an id or a event_id is provided, synchronize only this one campaign
   if (isset($params['id']) || isset($params['event_id'])) {
 
@@ -141,7 +152,13 @@ function civicrm_api3_twingle_event_Sync(array $params): array {
         }
         // Synchronize events
         if (!empty($event_from_twingle)) {
-          return _eventSync($event, $event_from_twingle, $twingleApi, $params);
+          return _eventSync(
+            $event,
+            $event_from_twingle,
+            $twingleApi,
+            $params,
+            $pull
+          );
         }
 
         // If Twingle does not know an event with the given event_id, give error
@@ -271,7 +288,13 @@ function civicrm_api3_twingle_event_Sync(array $params): array {
         $event = _instantiateEvent($event_from_civicrm, $event_from_civicrm['id']);
 
         // sync event
-        $result = _eventSync($event, $event_from_twingle, $twingleApi, $params);
+        $result = _eventSync(
+          $event,
+          $event_from_twingle,
+          $twingleApi,
+          $params,
+          $pull
+        );
         if ($result['is_error'] != 0) {
           $errors_occurred++;
           $result_values[$event->getId()] =
@@ -394,6 +417,7 @@ function _updateEventLocally(array $event_from_twingle,
  * @param array $event_from_twingle
  * @param \CRM_TwingleCampaign_BAO_TwingleApiCall $twingleApi
  * @param array $params
+ * @param bool $pull Force pulling event from Twingle and update local campaign
  *
  * @return array
  * @throws \CiviCRM_API3_Exception
@@ -401,12 +425,13 @@ function _updateEventLocally(array $event_from_twingle,
 function _eventSync(TwingleEvent $event,
               array $event_from_twingle,
               TwingleApiCall $twingleApi,
-              array $params): array {
+              array $params,
+              bool $pull = FALSE): array {
 
   // If Twingle's timestamp of the event differs from the timestamp of the
   // CiviCRM TwingleEvent campaign, update the campaign on CiviCRM's side.
   // NOTE: Changes on TwingleEvents are not meant to get pushed to Twingle
-  if ($event_from_twingle['updated_at'] != $event->lastUpdate()) {
+  if ($event_from_twingle['updated_at'] != $event->lastUpdate() || $pull) {
     return _updateEventLocally($event_from_twingle, $event, $params, $twingleApi);
   }
 
diff --git a/api/v3/TwingleProject/Sync.php b/api/v3/TwingleProject/Sync.php
index 7768997..0906f14 100644
--- a/api/v3/TwingleProject/Sync.php
+++ b/api/v3/TwingleProject/Sync.php
@@ -35,6 +35,13 @@ function _civicrm_api3_twingle_project_Sync_spec(array &$spec) {
     'api.required' => 0,
     'description'  => E::ts('If this is set true, no database change will be made'),
   ];
+  $spec['pull'] = [
+    'name'         => 'pull',
+    'title'        => E::ts('Pull from Twingle'),
+    'type'         => CRM_Utils_Type::T_BOOLEAN,
+    'api.required' => 0,
+    'description'  => E::ts('If this is set true, the project(s) will be pulled from Twingle and updated locally'),
+  ];
   $spec['twingle_api_key'] = [
     'name'         => 'twingle_api_key',
     'title'        => E::ts('Twingle API key'),
@@ -90,6 +97,10 @@ function civicrm_api3_twingle_project_Sync(array $params): array {
     Civi::cache('long')->set('twinglecampaign_twingle_api', $twingleApi);
   }
 
+  // Set pull flag
+  $pull = (isset($params['pull']) && $params['pull']);
+  unset($params['pull']);
+
   // If an id or a project_id is given, synchronize only this one campaign
   if (isset($params['id']) || isset($params['project_id'])) {
 
@@ -106,9 +117,15 @@ function civicrm_api3_twingle_project_Sync(array $params): array {
       $id = $result['id'];
       $project = new TwingleProject($result, $id);
 
-      // Synchronize projects
+      // Synchronize project
       if (!empty($project_from_twingle)) {
-        return _projectSync($project, $project_from_twingle, $twingleApi, $params);
+        return _projectSync(
+          $project,
+          $project_from_twingle,
+          $twingleApi,
+          $params,
+          $pull
+        );
       }
 
       // If Twingle does not know a project with the given project_id, give error
@@ -175,8 +192,10 @@ function civicrm_api3_twingle_project_Sync(array $params): array {
     // Push missing projects to Twingle
     $returnValues = [];
     foreach ($projects_from_civicrm['values'] as $project_from_civicrm) {
-      if (!in_array($project_from_civicrm['project_id'],
-        array_column($projects_from_twingle, 'id'))) {
+      if (
+        !in_array($project_from_civicrm['project_id'],
+        array_column($projects_from_twingle, 'id')
+        )) {
         // store campaign id in $id
         $id = $project_from_civicrm['id'];
         unset($project_from_civicrm['id']);
@@ -197,8 +216,11 @@ function civicrm_api3_twingle_project_Sync(array $params): array {
 
     // Create missing projects as campaigns in CiviCRM
     foreach ($projects_from_twingle as $project_from_twingle) {
-      if (!in_array($project_from_twingle['id'],
-        array_column($projects_from_civicrm['values'], 'project_id'))) {
+      if (
+        !in_array($project_from_twingle['id'],
+          array_column($projects_from_civicrm['values'],
+            'project_id')
+        )) {
         $project = new TwingleProject($project_from_twingle);
 
         try {
@@ -241,10 +263,12 @@ function civicrm_api3_twingle_project_Sync(array $params): array {
 
           // sync project
           $result = _projectSync(
-              $project,
-              $project_from_twingle,
-              $twingleApi,
-              $params);
+            $project,
+            $project_from_twingle,
+            $twingleApi,
+            $params,
+            $pull
+          );
           if (!$result['is_error'] == 0) {
             $errors[$result['id']] = $result['error_message'];
             $returnValues[$project->getId()] =
@@ -457,6 +481,7 @@ function _pushProjectToTwingle(TwingleProject $project,
  * @param array $project_from_twingle
  * @param \CRM_TwingleCampaign_BAO_TwingleApiCall $twingleApi
  * @param array $params
+ * @param bool $pull Force pulling project from Twingle and update local campaign
  *
  * @return array
  * @throws \CiviCRM_API3_Exception
@@ -464,11 +489,13 @@ function _pushProjectToTwingle(TwingleProject $project,
 function _projectSync(TwingleProject $project,
                       array $project_from_twingle,
                       TwingleApiCall $twingleApi,
-                      array $params): array {
+                      array $params,
+                      bool $pull = FALSE): array {
 
   // If Twingle's version of the project is newer than the CiviCRM
   // TwingleProject campaign, update the campaign
-  if ($project_from_twingle['last_update'] > $project->lastUpdate()) {
+  if ($project_from_twingle['last_update'] > $project->lastUpdate() ||
+      $pull) {
     return _updateProjectLocally($project_from_twingle, $project, $params, $twingleApi);
   }
 
diff --git a/l10n/de_DE/LC_MESSAGES/twinglecampaign.mo b/l10n/de_DE/LC_MESSAGES/twinglecampaign.mo
index e4a39ee..47867c3 100644
Binary files a/l10n/de_DE/LC_MESSAGES/twinglecampaign.mo and b/l10n/de_DE/LC_MESSAGES/twinglecampaign.mo differ
diff --git a/l10n/de_DE/LC_MESSAGES/twinglecampaign.po b/l10n/de_DE/LC_MESSAGES/twinglecampaign.po
index 7bfae67..7e83507 100644
--- a/l10n/de_DE/LC_MESSAGES/twinglecampaign.po
+++ b/l10n/de_DE/LC_MESSAGES/twinglecampaign.po
@@ -143,6 +143,18 @@ msgstr "keine"
 msgid "Upgrade %1 to revision %2"
 msgstr "Upgrade %1 auf Revision %2"
 
+#: CRM/TwingleCampaign/Upgrader.php
+msgid ""
+"Could not pull campaigns from Twingle to fill the campaign fields that were "
+"created within this update: %1"
+msgstr ""
+"Die zusätzlichen Kampagnenfelder, die in diesem Update erstellt wurden, "
+"konnten nicht von Twingle bezogen werden: %1"
+
+#: CRM/TwingleCampaign/Upgrader.php
+msgid "Scheduled Job"
+msgstr "Geplante Audgabe"
+
 #: CRM/TwingleCampaign/Upgrader.php
 msgid ""
 "Syncronizes all TwingleProjects an TwingleEvents between CiviCRM and Twingle"
@@ -154,18 +166,6 @@ msgstr ""
 msgid "Could not create scheduled job \"TwingleSync\"."
 msgstr "Geplante Aufgabe \"TwingleSync\" konnte nicht erstellt werden."
 
-#: CRM/TwingleCampaign/Upgrader.php
-msgid "Scheduled Job"
-msgstr "Geplante Audgabe"
-
-#: CRM/TwingleCampaign/Upgrader.php
-msgid ""
-"Could not create scheduled job \"TwingleSync\". Your Campaigns will not get "
-"synchronized to Twingle."
-msgstr ""
-"Geplante Aufgabe \"TwingleSync\" konnte nicht erstellt werden. Ihre "
-"Kampagnen werden nicht mit Twingle synchronisiert werden."
-
 #: CRM/TwingleCampaign/Upgrader.php
 msgid "Could not delete scheduled job \"TwingleSync\"."
 msgstr "Geplante Aufgabe \"TwingleSync\" konnte nicht gelöscht werden."
@@ -892,6 +892,14 @@ msgstr "Eltern Twingle Project ID"
 msgid "Twingle ID of the parent TwingleProject"
 msgstr "Twingle ID des Eltern-TwingleProject"
 
+#: api/v3/TwingleCampaign/Get.php api/v3/TwingleCampaign/Sync.php
+msgid "Parent Project ID"
+msgstr "Eltern-Projekt-ID"
+
+#: api/v3/TwingleCampaign/Get.php api/v3/TwingleCampaign/Sync.php
+msgid "ID of the parent TwingleProject"
+msgstr "ID des Eltern-TWinglePRoject"
+
 #: api/v3/TwingleCampaign/Get.php api/v3/TwingleCampaign/Getsingle.php
 #: api/v3/TwingleEvent/Get.php api/v3/TwingleEvent/Getsingle.php
 #: api/v3/TwingleProject/Get.php api/v3/TwingleProject/Getsingle.php
@@ -1021,6 +1029,18 @@ msgstr "Bestätigt am"
 msgid "When the Event was confirmed by its initiator"
 msgstr "Wenn das Event vom Initiator bestätigt wurrde"
 
+#: api/v3/TwingleEvent/Sync.php
+msgid "Pull"
+msgstr "Ziehen"
+
+#: api/v3/TwingleEvent/Sync.php
+msgid ""
+"If this is set true, the event(s) will be pulled from Twingle and updated "
+"locally"
+msgstr ""
+"Wenn dies auf wahr gesetzt ist, werden die Events von Twingle gezogen und "
+"lokal geupdated."
+
 #: api/v3/TwingleEvent/Sync.php api/v3/TwingleSync/Sync.php
 msgid "Limit"
 msgstr "Limit"
@@ -1122,6 +1142,18 @@ msgstr "Twingle Organisations ID"
 msgid "Your Twingle Organisation ID"
 msgstr "Ihre Twingle Organisations ID"
 
+#: api/v3/TwingleProject/Sync.php
+msgid "Pull from Twingle"
+msgstr "Von Twingle ziehen"
+
+#: api/v3/TwingleProject/Sync.php
+msgid ""
+"If this is set true, the project(s) will be pulled from Twingle and updated "
+"locally"
+msgstr ""
+"Wenn dies auf wahr gesetzt ist, werden die Projekte von Twingle gezogen und "
+"lokal geupdated."
+
 #: templates/CRM/TwingleCampaign/Form/Settings.tpl
 msgid "General Settings"
 msgstr "Allgemeine Einstellungen"
diff --git a/l10n/pot/twinglecampaign.pot b/l10n/pot/twinglecampaign.pot
index 0516610..b4a3038 100644
--- a/l10n/pot/twinglecampaign.pot
+++ b/l10n/pot/twinglecampaign.pot
@@ -99,11 +99,7 @@ msgid "Upgrade %1 to revision %2"
 msgstr ""
 
 #: ./CRM/TwingleCampaign/Upgrader.php
-msgid "Syncronizes all TwingleProjects an TwingleEvents between CiviCRM and Twingle"
-msgstr ""
-
-#: ./CRM/TwingleCampaign/Upgrader.php
-msgid "Could not create scheduled job \"TwingleSync\"."
+msgid "Could not pull campaigns from Twingle to fill the campaign fields that were created within this update: %1"
 msgstr ""
 
 #: ./CRM/TwingleCampaign/Upgrader.php
@@ -111,7 +107,11 @@ msgid "Scheduled Job"
 msgstr ""
 
 #: ./CRM/TwingleCampaign/Upgrader.php
-msgid "Could not create scheduled job \"TwingleSync\". Your Campaigns will not get synchronized to Twingle."
+msgid "Syncronizes all TwingleProjects an TwingleEvents between CiviCRM and Twingle"
+msgstr ""
+
+#: ./CRM/TwingleCampaign/Upgrader.php
+msgid "Could not create scheduled job \"TwingleSync\"."
 msgstr ""
 
 #: ./CRM/TwingleCampaign/Upgrader.php
@@ -802,6 +802,14 @@ msgstr ""
 msgid "Twingle ID of the parent TwingleProject"
 msgstr ""
 
+#: ./api/v3/TwingleCampaign/Get.php ./api/v3/TwingleCampaign/Sync.php
+msgid "Parent Project ID"
+msgstr ""
+
+#: ./api/v3/TwingleCampaign/Get.php ./api/v3/TwingleCampaign/Sync.php
+msgid "ID of the parent TwingleProject"
+msgstr ""
+
 #: ./api/v3/TwingleCampaign/Get.php ./api/v3/TwingleCampaign/Getsingle.php ./api/v3/TwingleEvent/Get.php ./api/v3/TwingleEvent/Getsingle.php ./api/v3/TwingleProject/Get.php ./api/v3/TwingleProject/Getsingle.php
 msgid "Campaign Name"
 msgstr ""
@@ -890,6 +898,14 @@ msgstr ""
 msgid "When the Event was confirmed by its initiator"
 msgstr ""
 
+#: ./api/v3/TwingleEvent/Sync.php
+msgid "Pull"
+msgstr ""
+
+#: ./api/v3/TwingleEvent/Sync.php
+msgid "If this is set true, the event(s) will be pulled from Twingle and updated locally"
+msgstr ""
+
 #: ./api/v3/TwingleEvent/Sync.php ./api/v3/TwingleSync/Sync.php
 msgid "Limit"
 msgstr ""
@@ -982,6 +998,14 @@ msgstr ""
 msgid "Your Twingle Organisation ID"
 msgstr ""
 
+#: ./api/v3/TwingleProject/Sync.php
+msgid "Pull from Twingle"
+msgstr ""
+
+#: ./api/v3/TwingleProject/Sync.php
+msgid "If this is set true, the project(s) will be pulled from Twingle and updated locally"
+msgstr ""
+
 #: ./templates/CRM/TwingleCampaign/Form/Settings.tpl
 msgid "General Settings"
 msgstr ""