fix: Adds manual return option (#290)

packages/medusa-fulfillment-manual/src/services/manual-fulfillment.js

@@ -12,6 +12,10 @@ class ManualFulfillmentService extends FulfillmentService {
       {
         id: "manual-fulfillment",
       },
+      {
+        id: "manual-fulfillment-return",
+        is_return: true,
+      },
     ]
   }
 
@@ -36,6 +40,11 @@ class ManualFulfillmentService extends FulfillmentService {
     return Promise.resolve({})
   }
 
+  createReturn() {
+    // No data is being sent anywhere
+    return Promise.resolve({})
+  }
+
   createFulfillment() {
     // No data is being sent anywhere
     return Promise.resolve({})