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+## Developer documentation
+
+### Overview
+
+The entry point of the plugin is the initialization of the singleton class `\Event_Bridge_For_ActivityPub\Setup` in the main plugin file `event-bridge-for-activitypub.php`.
+The constructor of that class calls its `setup_hooks()` function. This function provides hooks that initialize all parts of the _Event Bridge For ActivityPub_ whenever needed.
+
+### File structure
+
+Note that almost all files and folder within the `activitypub` folders are structured the same way as in the WordPress ActivityPub plugin.
+
+### Event Plugin Integrations
+
+This plugin supports multiple event plugins, even at the same time. To add a new one you first need to add some basic information about your event plugin. Just create a new file in `./includes/integrations/my-event-plugin.php`. Implement at least all abstract functions of the `Event_Plugin_Integration` class.
+
+#### Basic Event Plugin Integration
+
+```php
+  namespace Event_Bridge_For_ActivityPub\Integrations;
+
+  // Exit if accessed directly.
+  defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
+
+  /**
+   * Integration information for My Event Plugin
+   *
+   * This class defines necessary meta information is for the integration of My Event Plugin with the ActivityPub plugin.
+   */
+  final class My_Event_Plugin extends Event_Plugin_Integration {
+```
+
+#### Registering an Event Plugin Integration
+
+Then you need to tell the Event Bridge for ActivityPub about that class by adding it to the `EVENT_PLUGIN_INTEGRATIONS` constant in the `includes/setup.php` file:
+
+```php
+	private const EVENT_PLUGIN_INTEGRATIONS = array(
+		...
+		\Event_Bridge_For_ActivityPub\Integrations\My_Event_Plugin::class,
+	);
+```
+
+#### Additional Feature: Event Sources
+
+Not all _Event Plugin Integrations_ support the event-sources feature. To add support for it an integration must implement the `Feature_Event_Sources` interface.
+
+```php
+namespace Event_Bridge_For_ActivityPub\Integrations;
+
+// Exit if accessed directly.
+defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
+
+  /**
+   * Integration information for My Event Plugin.
+   *
+   * This class defines necessary meta information is for the integration of My Event Plugin with the ActivityPub plugin.
+   * This integration supports the Event Sources Feature.
+   */
+final class GatherPress extends Event_Plugin_Integration implements Feature_Event_Sources {
+```
+
+### Transformer
+
+Transformers are the classes that convert an WordPress post type (e.g. one used for events) to _ActivityStreams_.
+The Event Bridge for ActivityPub then takes care of applying the transformer, so you can jump right into [implementing it](./transformer.md).
+
+### Event Sources Feature – Transmogrifier
+
+The event sources feature allows to aggregate events from external ActivityPub actors. As the initialization of the Event-Sources feature is quite complex all of that initialization is done in the `init` function of the file `includes/class-event-sources.php` which is called by the `\Event_Bridge_For_ActivityPub\Setup` class (`includes/class-setup.php`).
+
+In this plugin we call a **_Transmogrifier_** the **opposite** of a **_Transformer_**. It takes care of converting an ActivityPub (`Event`) object in _ActivityStreams_ to the WordPress representation of an event plugin. The transmogrifier classes are only used when the `Event Sources` feature is activated. The _Event Bridge For ActivityPub_ can register transformers for multiple event plugins at the same time, however only one transmogrifier, that is one target even plugin can be used as a target for incoming external ActivityPub `Event` objects.