diff --git a/modules/ppcp-compat/src/Integration.php b/modules/ppcp-compat/src/Integration.php
new file mode 100644
index 000000000..4bb314581
--- /dev/null
+++ b/modules/ppcp-compat/src/Integration.php
@@ -0,0 +1,18 @@
+<?php
+/**
+ * Interface for all integration controllers.
+ *
+ * @package WooCommerce\PayPalCommerce\OrderTracking\Shipment
+ */
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Compat;
+
+interface Integration
+{
+    /**
+     * Integrates some (possibly external) service with PayPal Payments.
+     */
+    public function integrate(): void;
+}