Feat: Payment Restructuring to be fully event-driven

src/Payment/Contracts/Configurable.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Modules\Core\Payment\Contracts;
+
+/**
+ * Every driver implements this, orthogonal to which payment operations
+ * (SupportsPay, SupportsAuthorization, ...) it supports — whether a driver
+ * can actually be used right now is a separate question from what it's
+ * capable of when it can be. An offline driver has no external dependency
+ * to be missing and always returns true; a gateway driver checks its own
+ * credentials/API key.
+ */
+interface Configurable
+{
+    /**
+     * Independent of any admin-facing enabled/disabled toggle a caller
+     * might also apply on top — this is only about whether the driver
+     * itself is usable right now (e.g. Stripe with no API key configured
+     * is never usable, regardless of any such toggle).
+     */
+    public function isConfigured(): bool;
+}