diff --git a/activitypub.php b/activitypub.php
index 10dfe9d..38a3d07 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -17,12 +17,13 @@ namespace Activitypub;
 
 use function Activitypub\site_supports_blocks;
 
-\defined( 'ACTIVITYPUB_REST_NAMESPACE' ) || \define( 'ACTIVITYPUB_REST_NAMESPACE', 'activitypub/1.0' );
+require_once __DIR__ . '/includes/functions.php';
 
 /**
- * Initialize plugin
+ * Initialize the plugin constants.
  */
-function init() {
+function define_constants() {
+	\defined( 'ACTIVITYPUB_REST_NAMESPACE' ) || \define( 'ACTIVITYPUB_REST_NAMESPACE', 'activitypub/1.0' );
 	\defined( 'ACTIVITYPUB_EXCERPT_LENGTH' ) || \define( 'ACTIVITYPUB_EXCERPT_LENGTH', 400 );
 	\defined( 'ACTIVITYPUB_SHOW_PLUGIN_RECOMMENDATIONS' ) || \define( 'ACTIVITYPUB_SHOW_PLUGIN_RECOMMENDATIONS', true );
 	\defined( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS' ) || \define( 'ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS', 3 );
@@ -30,19 +31,18 @@ function init() {
 	\defined( 'ACTIVITYPUB_USERNAME_REGEXP' ) || \define( 'ACTIVITYPUB_USERNAME_REGEXP', '(?:([A-Za-z0-9_-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+))' );
 	\defined( 'ACTIVITYPUB_CUSTOM_POST_CONTENT' ) || \define( 'ACTIVITYPUB_CUSTOM_POST_CONTENT', "<strong>[ap_title]</strong>\n\n[ap_content]\n\n[ap_hashtags]\n\n[ap_shortlink]" );
 	\defined( 'ACTIVITYPUB_AUTHORIZED_FETCH' ) || \define( 'ACTIVITYPUB_AUTHORIZED_FETCH', false );
+	\defined( 'ACTIVITYPUB_DISABLE_REWRITES' ) || \define( 'ACTIVITYPUB_DISABLE_REWRITES', false );
 
 	\define( 'ACTIVITYPUB_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 	\define( 'ACTIVITYPUB_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );
 	\define( 'ACTIVITYPUB_PLUGIN_FILE', plugin_dir_path( __FILE__ ) . '/' . basename( __FILE__ ) );
 	\define( 'ACTIVITYPUB_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
+}
 
-	Migration::init();
-	Activitypub::init();
-	Activity_Dispatcher::init();
-	Collection\Followers::init();
-	Comments::init();
-
-	// Configure the REST API route
+/**
+ * Initialize REST routes.
+ */
+function rest_init() {
 	Rest\Users::init();
 	Rest\Outbox::init();
 	Rest\Inbox::init();
@@ -52,23 +52,46 @@ function init() {
 	Rest\Server::init();
 	Rest\Collection::init();
 
-	Admin::init();
-	Hashtag::init();
-	Shortcodes::init();
-	Mention::init();
-	Health_Check::init();
-	Scheduler::init();
-
-	if ( site_supports_blocks() ) {
-		Blocks::init();
+	// load NodeInfo endpoints only if blog is public
+	if ( \get_option( 'blog_public', 1 ) ) {
+		Rest\NodeInfo::init();
 	}
 }
-\add_action( 'init', __NAMESPACE__ . '\init' );
+\add_action( 'rest_api_init', __NAMESPACE__ . '\rest_init' );
+
+/**
+ * Initialize plugin.
+ */
+function plugin_init() {
+	define_constants();
+
+	\add_action( 'init', array( __NAMESPACE__ . '\Migration', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Activitypub', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Activity_Dispatcher', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Collection\Followers', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Admin', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Hashtag', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Shortcodes', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Mention', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Health_Check', 'init' ) );
+	\add_action( 'init', array( __NAMESPACE__ . '\Scheduler', 'init' ) );
+
+	if ( site_supports_blocks() ) {
+		\add_action( 'init', array( __NAMESPACE__ . '\Blocks', 'init' ) );
+	}
+
+	$debug_file = __DIR__ . '/includes/debug.php';
+	if ( \WP_DEBUG && file_exists( $debug_file ) && is_readable( $debug_file ) ) {
+		require_once $debug_file;
+		Debug::init();
+	}
+}
+\add_action( 'plugins_loaded', __NAMESPACE__ . '\plugin_init' );
 
 /**
  * Class Autoloader
  */
-spl_autoload_register(
+\spl_autoload_register(
 	function ( $full_class ) {
 		$base_dir = __DIR__ . '/includes/';
 		$base     = 'Activitypub\\';
@@ -101,19 +124,6 @@ spl_autoload_register(
 	}
 );
 
-require_once __DIR__ . '/includes/functions.php';
-
-// load NodeInfo endpoints only if blog is public
-if ( \get_option( 'blog_public', 1 ) ) {
-	Rest\NodeInfo::init();
-}
-
-$debug_file = __DIR__ . '/includes/debug.php';
-if ( \WP_DEBUG && file_exists( $debug_file ) && is_readable( $debug_file ) ) {
-	require_once $debug_file;
-	Debug::init();
-}
-
 /**
  * Add plugin settings link
  */
diff --git a/includes/class-activitypub.php b/includes/class-activitypub.php
index e54249d..8704ded 100644
--- a/includes/class-activitypub.php
+++ b/includes/class-activitypub.php
@@ -236,6 +236,12 @@ class Activitypub {
 	 * Add rewrite rules
 	 */
 	public static function add_rewrite_rules() {
+		// If another system needs to take precedence over the ActivityPub rewrite rules,
+		// they can define their own and will manually call the appropriate functions as required.
+		if ( ACTIVITYPUB_DISABLE_REWRITES ) {
+			return;
+		}
+
 		if ( ! \class_exists( 'Webfinger' ) ) {
 			\add_rewrite_rule(
 				'^.well-known/webfinger',
diff --git a/includes/rest/class-collection.php b/includes/rest/class-collection.php
index 9e50835..5fa585d 100644
--- a/includes/rest/class-collection.php
+++ b/includes/rest/class-collection.php
@@ -25,7 +25,7 @@ class Collection {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
 	}
 
 	/**
diff --git a/includes/rest/class-followers.php b/includes/rest/class-followers.php
index c125fcd..b7be9d0 100644
--- a/includes/rest/class-followers.php
+++ b/includes/rest/class-followers.php
@@ -22,7 +22,7 @@ class Followers {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
 	}
 
 	/**
diff --git a/includes/rest/class-following.php b/includes/rest/class-following.php
index 48e3ca0..33bdf65 100644
--- a/includes/rest/class-following.php
+++ b/includes/rest/class-following.php
@@ -18,7 +18,8 @@ class Following {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
+
 		\add_filter( 'activitypub_rest_following', array( self::class, 'default_following' ), 10, 2 );
 	}
 
diff --git a/includes/rest/class-inbox.php b/includes/rest/class-inbox.php
index fb220bd..e899093 100644
--- a/includes/rest/class-inbox.php
+++ b/includes/rest/class-inbox.php
@@ -24,7 +24,7 @@ class Inbox {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
 
 		\add_action( 'activitypub_inbox_create', array( self::class, 'handle_create' ), 10, 2 );
 	}
diff --git a/includes/rest/class-nodeinfo.php b/includes/rest/class-nodeinfo.php
index 711d4fd..8e62874 100644
--- a/includes/rest/class-nodeinfo.php
+++ b/includes/rest/class-nodeinfo.php
@@ -17,7 +17,8 @@ class Nodeinfo {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
+
 		\add_filter( 'nodeinfo_data', array( self::class, 'add_nodeinfo_discovery' ), 10, 2 );
 		\add_filter( 'nodeinfo2_data', array( self::class, 'add_nodeinfo2_discovery' ), 10 );
 	}
diff --git a/includes/rest/class-ostatus.php b/includes/rest/class-ostatus.php
deleted file mode 100644
index 415d502..0000000
--- a/includes/rest/class-ostatus.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-namespace Activitypub\Rest;
-
-/**
- * ActivityPub OStatus REST-Class
- *
- * @author Matthias Pfefferle
- *
- * @see https://www.w3.org/community/ostatus/
- */
-class Ostatus {
-	/**
-	 * Register routes
-	 */
-	public static function register_routes() {
-		\register_rest_route(
-			ACTIVITYPUB_REST_NAMESPACE,
-			'/ostatus/remote-follow',
-			array(
-				array(
-					'methods'             => \WP_REST_Server::READABLE,
-					'callback'            => array( '\Activitypub\Rest\Ostatus', 'get' ),
-					// 'args'     => self::request_parameters(),
-					'permission_callback' => '__return_true',
-				),
-			)
-		);
-	}
-
-	public static function get() {
-		// @todo implement
-	}
-}
diff --git a/includes/rest/class-outbox.php b/includes/rest/class-outbox.php
index 2f50bd7..eb35e86 100644
--- a/includes/rest/class-outbox.php
+++ b/includes/rest/class-outbox.php
@@ -24,7 +24,7 @@ class Outbox {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
 	}
 
 	/**
diff --git a/includes/rest/class-server.php b/includes/rest/class-server.php
index 01d9a9a..d15831a 100644
--- a/includes/rest/class-server.php
+++ b/includes/rest/class-server.php
@@ -18,7 +18,8 @@ class Server {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
+
 		\add_filter( 'rest_request_before_callbacks', array( self::class, 'authorize_activitypub_requests' ), 10, 3 );
 	}
 
diff --git a/includes/rest/class-users.php b/includes/rest/class-users.php
index 820f653..31a92dd 100644
--- a/includes/rest/class-users.php
+++ b/includes/rest/class-users.php
@@ -23,7 +23,7 @@ class Users {
 	 * Initialize the class, registering WordPress hooks
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
 	}
 
 	/**
diff --git a/includes/rest/class-webfinger.php b/includes/rest/class-webfinger.php
index 4504e0d..315fee1 100644
--- a/includes/rest/class-webfinger.php
+++ b/includes/rest/class-webfinger.php
@@ -19,7 +19,8 @@ class Webfinger {
 	 * @return void
 	 */
 	public static function init() {
-		\add_action( 'rest_api_init', array( self::class, 'register_routes' ) );
+		self::register_routes();
+
 		\add_filter( 'webfinger_user_data', array( self::class, 'add_user_discovery' ), 10, 3 );
 		\add_filter( 'webfinger_data', array( self::class, 'add_pseudo_user_discovery' ), 99, 2 );
 	}
diff --git a/includes/transformer/class-post.php b/includes/transformer/class-post.php
index d22304f..dbe9693 100644
--- a/includes/transformer/class-post.php
+++ b/includes/transformer/class-post.php
@@ -452,6 +452,15 @@ class Post {
 	protected function get_content() {
 		global $post;
 
+		/**
+		 * Provides an action hook so plugins can add their own hooks/filters before AP content is generated.
+		 *
+		 * Example: if a plugin adds a filter to `the_content` to add a button to the end of posts, it can also remove that filter here.
+		 *
+		 * @param WP_Post $post The post object.
+		 */
+		do_action( 'activitypub_before_get_content', $post );
+
 		// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
 		$post    = $this->wp_post;
 		$content = $this->get_post_content_template();