fix(handle-callback): on token update, merge firestore doc with store and authentication ids

Author: leomp12

lib/methods/handle-callback.js

@@ -68,7 +68,9 @@ const handleCallback = client => {
           firestoreDoc = {
             access_token: reqBody.access_token,
             expires: reqBody.expires,
-            updated_at: require('firebase-admin').firestore.Timestamp.now()
+            updated_at: require('firebase-admin').firestore.Timestamp.now(),
+            authentication_id: authenticationId,
+            store_id: storeId
           }
         } else {
           values = [