diff --git a/clickup-webhook-receiver/index.php b/clickup-webhook-receiver/index.php
new file mode 100644
index 0000000..f80be04
--- /dev/null
+++ b/clickup-webhook-receiver/index.php
@@ -0,0 +1,114 @@
+<?php
+/**
+ * Receive ClickUp webhooks
+ *
+ * Documentation:
+ * https://clickup.com/api/developer-portal/webhooktaskpayloads/
+ */
+
+require realpath( __DIR__ ) . '/../autoload.php';
+
+$response = file_get_contents('php://input');
+$response_data = json_decode( $response );
+
+$event           = $response_data->event        ?? null;
+$clickup_task_id = $response_data->task_id      ?? null;
+$webhook_id      = $_SERVER['HTTP_X_SIGNATURE'] ?? null;
+
+// check incoming request
+if( CLICKUP_VALIDATE_WEBHOOK && $webhook_id !== CLICKUP_REGISTERED_WEBHOOK_ID ) {
+	echo "Unknown webhook signature\n";
+	throw new Exception( sprintf( "unknown webhook ID: %s", $webhook_id ) );
+}
+
+$cache = ClickUpPhabricatorCache::instance();
+
+switch( $event ) {
+
+	case 'taskCreated':
+
+		// get more ClickUp info (title and description etc.) and remember in cache
+		$clickup_task_details = ClickUpAPI::queryTaskData( $clickup_task_id );
+
+		// TODO: move in the QueryTaskData some validation on these
+		$clickup_task_title       = $clickup_task_details->name;
+		$clickup_task_descr       = $clickup_task_details->description;
+		$clickup_task_folder      = $clickup_task_details->folder;
+		$clickup_task_folder_id   = $clickup_task_folder->id;
+		$clickup_task_folder_name = $clickup_task_folder->name;
+
+		if( !$clickup_task_title ) {
+			throw new Exception( "missing title in new ClickUp Task" );
+		}
+
+		// prepare description for new Task in Phabricator
+		$phab_task_description  = $clickup_task_descr;
+		$phab_task_description .= "\n\n";
+		$phab_task_description .= "> https://app.clickup.com/t/$clickup_task_id";
+
+		$phab_task_args = [];
+
+		// try to assign to the right project
+		$phab_task_project = $cache->getPhabricatorTagIDFromClickupFolderID( $clickup_task_folder_id );
+		if( $phab_task_project ) {
+			// assign to the right project
+			$phab_task_args['projects.add'] = [ $phab_task_project ];
+		} else {
+			// or just give an hint
+			$clickup_task_title = "[$clickup_task_folder_name] $clickup_task_title";
+		}
+
+		$phab_task_args['title'] = $clickup_task_title;
+		$phab_task_args['description'] = $phab_task_description;
+
+		// create Task in Phabricator
+		$phab_task_data = PhabricatorAPI::createTask( $phab_task_args );
+		$phab_task_phid = $phab_task_data['object']['phid']; // TASK-PHID-00000000
+		$phab_task_id   = $phab_task_data['object']['id'];   // 123 for T123
+
+		// associate the Phabricator Task to the Conduit Task in the cache
+		$cache->newlock()->registerClickupPhabricatorTaskID( $clickup_task_id, $phab_task_id )->save();
+
+		// update Click-Up adding the Phabricator URL
+		$phab_task_url = PHABRICATOR_URL . "T{$phab_task_id}";
+		ClickUpAPI::putTaskData( $clickup_task_id, [], [
+			'description' => "$clickup_task_descr\n\n$phab_task_url",
+		] );
+		break;
+
+	case 'taskDeleted':
+
+		// mark as invalid in Phabricator
+		$phab_task_id = $cache->getClickupTaskPhabricatorID( $clickup_task_id );
+		if( $phab_task_id ) {
+			PhabricatorAPI::editTask( $phab_task_id, [
+				'status' => 'invalid',
+			] );
+		}
+
+		// drop from cache
+		$cache->removeClickupTask( $clickup_task_id );
+		break;
+
+	case 'taskCommentPosted':
+
+		// post the comment on Phabricator too
+		$phab_task_id = $cache->getClickupTaskPhabricatorID( $clickup_task_id );
+		if( $phab_task_id ) {
+			$phab_comment = "Test:\n\n";
+			$phab_task_data = PhabricatorAPI::editTask( $phab_task_id, [
+				'comment' => $phab_comment,
+			] );
+		}
+		break;
+
+//	case 'taskUpdated':
+
+//		break;
+
+	default:
+		echo "Method not supported.\n";
+		error_log( "unsupported ClickUp webhoook: $event" );
+}
+
+$cache->save();