Adds medusa subcribers

packages/medusa/src/subscribers/order.js

@@ -0,0 +1,17 @@
+class OrderSubscriber {
+  constructor({ paymentProviderService, eventBusService }) {
+    this.paymentProviderService_ = paymentProviderService
+
+    this.eventBus_ = eventBusService
+
+    this.eventBus_.subscribe("order.completed", async order => {
+      const paymentProvider = this.paymentProviderService_.retrieveProvider(
+        order.payment_method.provider_id
+      )
+
+      await paymentProvider.capturePayment(order._id)
+    })
+  }
+}
+
+export default OrderSubscriber