diff --git a/CRM/TwingleCampaign/BAO/TwingleCampaign.php b/CRM/TwingleCampaign/BAO/TwingleCampaign.php
index d8373ce..b227cbb 100644
--- a/CRM/TwingleCampaign/BAO/TwingleCampaign.php
+++ b/CRM/TwingleCampaign/BAO/TwingleCampaign.php
@@ -1,28 +1,363 @@
 <?php
 
+use CRM_TwingleCampaign_Utils_ExtensionCache as ExtensionCache;
+use CRM_TwingleCampaign_ExtensionUtil as E;
 
 class CRM_TwingleCampaign_BAO_TwingleCampaign {
 
+  // IN means: heading into CiviCRM database
+  public const IN = 'IN';
+
+  // OUT means: coming from the CiviCRM database
+  public const OUT = 'OUT';
+
+  private $prefix;
+
   private $id;
 
-  private $tw_cid;
+  private $campaign_type_id;
+
+  private $values;
 
 
   /**
-   * TwingleCampaign constructor.
+   * ## TwingleCampaign constructor
+   *
+   * @param array|null $values
+   *
+   * @throws CiviCRM_API3_Exception
    */
-  public function __construct() {
+  public function __construct(array $values = NULL) {
+
+    $this->prefix = 'twingle_campaign_';
+    $this->id = $values['id'] ?? NULL;
+    $this->values['campaign_type_id'] = 'twingle_campaign';
+
+    if ($this->id) {
+      $this->fetch();
+      if ($values) {
+        $this->update($values);
+      }
+      $this->getParentProject();
+      $this->createCid();
+      $this->createUrl();
+    }
+    elseif ($values) {
+      $this->update($values);
+    }
+  }
+
+
+  /**
+   * ## Create TwingleCampaign
+   * Create this TwingleCampaign as a campaign in CiviCRM
+   *
+   * @param bool $no_hook
+   *
+   * @throws \CiviCRM_API3_Exception
+   */
+  public function create(bool $no_hook = FALSE) {
+
+    // Set a flag to not trigger the hook
+    if ($no_hook) {
+      $_SESSION['CiviCRM']['de.forumzfd.twinglecampaign']['no_hook'] = TRUE;
+    }
+
+    $values = $this->values;
+
+    $this->translateCustomFields($values, self::IN);
+
+    $result = civicrm_api3('Campaign', 'create', $values);
+
+    if ($result['is_error'] != 1) {
+      $this->id = $result['id'];
+      $this->values = $result['values'];
+    }
+  }
+
+
+  /**
+   * ## Fetch TwingleCampaign
+   * Populate this instance with values from an existing TwingleCampaign.
+   *
+   * @throws CiviCRM_API3_Exception
+   */
+  private function fetch() {
+    $this->values = civicrm_api3('Campaign', 'getsingle',
+      ['id' => $this->id]);
+  }
+
+
+  /**
+   * ## Get Parent Project
+   * Determines the id of the parent TwingleProject. If there is no parent
+   * TwingleProject, an error message is shown on UI and the campaign gets
+   * deleted.
+   *
+   * @throws \CiviCRM_API3_Exception
+   */
+  private function getParentProject(): void {
+
+    // Get campaign type id for TwingleProject
+    $twingle_project_campaign_type_id =
+      ExtensionCache::getInstance()
+        ->getCampaigns()['campaign_types']['twingle_project']['id'];
+
+    // Determine the parent project id by looping through the campaign tree
+    // until the parent campaign type is a TwingleProject
+    $parent_id = $this->values['parent_id'];
+
+    $parent_campaign_type_id = NULL;
+
+    while ($parent_id && $parent_campaign_type_id != $twingle_project_campaign_type_id) {
+      // Get parent campaign
+      $parent_campaign = civicrm_api3('Campaign', 'getsingle',
+        ['id' => $parent_id]);
+
+      if ($parent_campaign['is_error'] != 1) {
+        $parent_campaign_type_id = $parent_campaign['campaign_type_id'];
+        if ($parent_campaign['parent_id']) {
+          $parent_id = $parent_campaign['parent_id'];
+        }
+        else {
+          break;
+        }
+      }
+      else {
+        throw new CiviCRM_API3_Exception($parent_campaign['error_message']);
+      }
+    }
+
+    // Set parent_project_id and retrieve parent_project_url
+    if ($parent_campaign_type_id == $twingle_project_campaign_type_id) {
+      $this->values['parent_project_id'] = $parent_id;
+
+      // Get custom field name for twingle_project_page field
+      $cf_page = ExtensionCache::getInstance()
+        ->getCustomFieldMapping('twingle_project_page');
+
+      // Extract twingle_project_page url from parent_campaign
+      if ($parent_campaign[$cf_page]) {
+        $this->values['parent_project_url'] = $parent_campaign[$cf_page];
+      }
+
+      // If twingle_project_widget value is missing, try a synchronization
+      else {
+        $parent_campaign = civicrm_api3('TwingleProject', 'sync',
+          ['id' => $parent_id]);
+
+        // Now try again to extract the twingle_project_widget url
+        if ($parent_campaign[$cf_url]) {
+          $this->values['parent_project_url'] = $parent_campaign[$cf_url];
+        }
+
+        // If twingle_project_widget value is still missing, show an alert on
+        // UI, log an error and delete this TwingleCampaign
+        else {
+          CRM_Core_Session::setStatus(
+            ts("Could not determine parent TwingleProject URL. This URL is 
+            needed to create the TwingleEvent URL. Please check the logs."),
+            ts('Parent project URL missing'),
+            'alert'
+          );
+          Civi::log()->error(
+            E::LONG_NAME .
+            ' could not determine parent TwingleProject URL.',
+            $this->getResponse()
+          );
+          $this->delete();
+        }
+      }
+
+      // If this TwingleCampaign has no parent TwingleProject above it in the
+      // campaign tree
+    }
+    else {
+      CRM_Core_Session::setStatus(
+        ts("TwingleCampaigns can only get created as a child of a 
+        TwingleProject in the campaign tree."),
+        ts('No parent TwingleProject found'),
+        'alert'
+      );
+      $this->delete();
+    }
+  }
+
+  /**
+   * ## Create URL
+   * Create a URL by adding a tw_cid
+   */
+  private function createUrl() {
+    $this->values['url'] =
+      $this->values['parent_project_url'] . '?tw_cid=' . $this->values['cid'];
+  }
+
+
+  /**
+   *
+   */
+  private function createCid() {
+    $this->values['cid'] = md5($this->id . '_' . $this->values['name']);
+  }
+
+  /**
+   *
+   */
+  private function validateCid() {
 
   }
 
-  public function create() {
+
+  /**
+   *
+   */
+  private function decodeCid() {
 
   }
 
-  public function exists() {
 
+  /**
+   * ## Translate field names and custom field names
+   *
+   * Constants for **$direction**:<br>
+   * **Campaign::IN** Translate field name to custom field name <br>
+   * **Campaign::OUT** Translate from custom field name to field name
+   *
+   * @param array $values
+   * array of keys to translate
+   *
+   * @param string $direction
+   * const: Campaign::OUT or Campaign::OUT
+   */
+  public function translateCustomFields(array &$values, string $direction) {
+
+    // Translate field name to custom field name
+    if ($direction == self::IN) {
+
+      foreach (ExtensionCache::getInstance()
+                 ->getCustomFieldMapping() as $field => $custom) {
+
+        if (array_key_exists(
+          str_replace(
+            $this->prefix,
+            '',
+            $field
+          ),
+          $values)
+        ) {
+
+          $values[$custom] = $values[str_replace(
+            $this->prefix,
+            '',
+            $field
+          )];
+
+          unset($values[str_replace(
+              $this->prefix,
+              '',
+              $field
+            )]
+          );
+        }
+      }
+    }
+    // Translate from custom field name to field name
+    elseif ($direction == self::OUT) {
+
+      foreach (ExtensionCache::getInstance()
+                 ->getCustomFieldMapping() as $field => $custom) {
+
+        if (array_key_exists(
+          $custom,
+          $values
+        )
+        ) {
+          $values[str_replace(
+            $this->prefix,
+            '',
+            $field
+          )] = $values[$custom];
+          unset($values[$custom]);
+        }
+      }
+    }
   }
 
 
+  /**
+   * ## Delete TwingleCampaign
+   * Deletes this TwingleCampaign from CiviCRM
+   */
+  private function delete() {
+    if ($this->id) {
+      try {
+        civicrm_api3('Campaign', 'delete', ['id' => $this->id]);
+      } catch (CiviCRM_API3_Exception $e) {
+        Civi::log()->error(
+          E::LONG_NAME .
+          ' could delete TwingleCampaign: ' .
+          $e->getMessage(),
+          $this->getResponse()
+        );
+      }
+    }
+  }
+
+
+  /**
+   * ## Get a response
+   * Get a response that describes the status of this TwingleCampaign instance.
+   * Returns an array that contains **title**, **id**, **parent_project_id**
+   * (if available) and **status** (if provided)
+   *
+   * @param string|null $status
+   * status of the TwingleCampaign you want to give back along with the response
+   *
+   * @return array
+   */
+  public function getResponse(string $status = NULL): array {
+    $response = [
+      'title' => $this->values['title'],
+      'id'    => (int) $this->id,
+    ];
+    if ($status) {
+      $response['status'] = $status;
+    }
+    if ($this->values['parent_project_id']) {
+      $response['parent_project_id'] = (int) $this->values['parent_project_id'];
+    }
+    return $response;
+  }
+
+
+  /**
+   * ## Update values
+   * Updates all values in **$this->values** array.
+   *
+   * @param array $values
+   * values that should get updated
+   */
+  private function update(array $values) {
+    $filter = ExtensionCache::getInstance()->getTemplates()['TwingleCampaign'];
+    foreach ($values as $key => $value) {
+      if (in_array($key, $filter)) {
+        $this->values[$key] = $values[$key];
+      }
+    }
+  }
+
+  /**
+   * ## Clone this TwingleProject
+   *
+   * This method removes the id from this instance and in the next step it
+   * creates the clone as a new TwingleCampaign with the same values to
+   * Twingle.
+   *
+   * @throws \CiviCRM_API3_Exception
+   */
+  public function clone() {
+    // TODO: implement cloning
+  }
+
 
 }
\ No newline at end of file
diff --git a/CRM/TwingleCampaign/resources/campaigns.json b/CRM/TwingleCampaign/resources/campaigns.json
index 329261d..a38863c 100644
--- a/CRM/TwingleCampaign/resources/campaigns.json
+++ b/CRM/TwingleCampaign/resources/campaigns.json
@@ -130,6 +130,19 @@
       "is_view": 0,
       "weight": 5
     },
+    "twingle_project_page": {
+      "custom_group_id": "Twingle_Project_Embed_Codes",
+      "label": "Twingle Project Page",
+      "name": "twingle_project_page",
+      "is_required": 0,
+      "is_searchable": 0,
+      "data_type": "Memo",
+      "html_type": "TextArea",
+      "text_length": 600,
+      "is_active": 1,
+      "is_view": 0,
+      "weight": 1
+    },
     "twingle_project_widget": {
       "custom_group_id": "Twingle_Project_Embed_Codes",
       "label": "Twingle Project Widget",
@@ -399,6 +412,32 @@
       "is_active": 1,
       "is_view": 1,
       "weight": 15
+    },
+    "twingle_campaign_parent_project_id": {
+      "custom_group_id": "Twingle_Campaign_Information",
+      "label": "Parent TwingleProject ID",
+      "name": "twingle_campaign_parent_project_id",
+      "is_required": 0,
+      "is_searchable": 1,
+      "data_type": "String",
+      "html_type": "Text",
+      "text_length": 16,
+      "is_active": 1,
+      "is_view": 1,
+      "weight": 1
+    },
+    "twingle_campaign_url": {
+      "custom_group_id": "Twingle_Campaign_Information",
+      "label": "Twingle Campaign URL",
+      "name": "twingle_campaign_url",
+      "is_required": 0,
+      "is_searchable": 0,
+      "data_type": "Memo",
+      "html_type": "TextArea",
+      "text_length": 600,
+      "is_active": 1,
+      "is_view": 1,
+      "weight": 2
     }
   }
 }
diff --git a/api/v3/TwingleCampaign/Create.php b/api/v3/TwingleCampaign/Create.php
index f276bdf..c1aa084 100644
--- a/api/v3/TwingleCampaign/Create.php
+++ b/api/v3/TwingleCampaign/Create.php
@@ -1,4 +1,6 @@
 <?php
+
+use CRM_TwingleCampaign_BAO_TwingleCampaign as TwingleCampaign;
 use CRM_TwingleCampaign_ExtensionUtil as E;
 
 /**
@@ -9,37 +11,74 @@ use CRM_TwingleCampaign_ExtensionUtil as E;
  *
  * @see https://docs.civicrm.org/dev/en/latest/framework/api-architecture/
  */
-function _civicrm_api3_twingle_campaign_Create_spec(&$spec) {
-  $spec['magicword']['api.required'] = 1;
+function _civicrm_api3_twingle_campaign_Create_spec(array &$spec) {
+  $spec['id'] = [
+    'name'         => 'id',
+    'title'        => E::ts('Twingle Project ID'),
+    'type'         => CRM_Utils_Type::T_INT,
+    'api.required' => 0,
+    'description'  => E::ts('The Twingle Project ID'),
+  ];
+  $spec['name'] = [
+    'name'         => 'name',
+    'title'        => E::ts('Twingle Campaign Name'),
+    'type'         => CRM_Utils_Type::T_STRING,
+    'api.required' => 0,
+    'description'  => E::ts('Name of the Twingle Project'),
+  ];
+  $spec['title'] = [
+    'name'         => 'title',
+    'title'        => E::ts('Twingle Campaign Title'),
+    'type'         => CRM_Utils_Type::T_STRING,
+    'api.required' => 1,
+    'description'  => E::ts('Title of the Twingle Campaign'),
+  ];
+  $spec['parent_id'] = [
+    'name'         => 'parent_id',
+    'title'        => E::ts('Parent Campaign'),
+    'type'         => CRM_Utils_Type::T_INT,
+    'api.required' => 1,
+    'description'  => E::ts('Optional parent id for this Campaign'),
+  ];
 }
 
+
 /**
- * TwingleCampaign.Create API
+ * # TwingleCampaign.Create API
  *
  * @param array $params
  *
  * @return array
  *   API result descriptor
  *
+ * @throws CiviCRM_API3_Exception
  * @see civicrm_api3_create_success
- *
- * @throws API_Exception
  */
-function civicrm_api3_twingle_campaign_Create($params) {
-  if (array_key_exists('magicword', $params) && $params['magicword'] == 'sesame') {
-    $returnValues = array(
-      // OK, return several data rows
-      12 => ['id' => 12, 'name' => 'Twelve'],
-      34 => ['id' => 34, 'name' => 'Thirty four'],
-      56 => ['id' => 56, 'name' => 'Fifty six'],
-    );
-    // ALTERNATIVE: $returnValues = []; // OK, success
-    // ALTERNATIVE: $returnValues = ["Some value"]; // OK, return a single value
+function civicrm_api3_twingle_campaign_Create(array $params): array {
 
-    // Spec: civicrm_api3_create_success($values = 1, $params = [], $entity = NULL, $action = NULL)
-    return civicrm_api3_create_success($returnValues, $params, 'TwingleCampaign', 'Create');
-  }
-  else {
-    throw new API_Exception(/*error_message*/ 'Everyone knows that the magicword is "sesame"', /*error_code*/ 'magicword_incorrect');
+  // instantiate TwingleCampaign
+  $campaign = new TwingleCampaign($params);
+
+  // Try to create the TwingleCampaign
+  try {
+    $campaign->create();
+    return civicrm_api3_create_success(
+      $campaign->getResponse('TwingleCampaign created'),
+      $params,
+      'TwingleCampaign',
+      'Create'
+    );
+  } catch(Exception $e){
+    Civi::log()->error(
+      E::LONG_NAME .
+      ' could not create TwingleCampaign: ' .
+      $e->getMessage(),
+      $campaign->getResponse()
+    );
+    return civicrm_api3_create_error(
+      'Could not create TwingleCampaign: ' . $e->getMessage(),
+      $campaign->getResponse()
+    );
   }
+
 }