diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 00000000..01b90eec
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,22 @@
+version: 2.1
+
+commands:
+  return_error:
+    steps:
+      - run: return 1
+
+jobs:
+  my_job:
+    docker:
+      - image: circleci/node:13.8.0
+    steps:
+      - return_error
+      - run:
+          name: Non-Zero error 
+          command: echo "non-zero error"
+          when: on_fail
+
+workflows:
+  my_workflow:
+    jobs:
+      - my_job
\ No newline at end of file
diff --git a/guestbook.js b/guestbook.js
index 22363fbc..d912aed9 100644
--- a/guestbook.js
+++ b/guestbook.js
@@ -1,13 +1,13 @@
 /**
  * Web application
  */
-const apiUrl = '';
+const apiUrl = 'https://eu-gb.functions.appdomain.cloud/api/v1/web/2405b280-c725-44a2-84ad-159bbb34ac3f/guestbook';
 const guestbook = {
   // retrieve the existing guestbook entries
   get() {
     return $.ajax({
       type: 'GET',
-      url: `${apiUrl}/entries`,
+      url: `${apiUrl}/read-guestbook-entries-sequence.json`,
       dataType: 'json'
     });
   },
@@ -16,7 +16,7 @@ const guestbook = {
     console.log('Sending', name, email, comment)
     return $.ajax({
       type: 'PUT',
-      url: `${apiUrl}/entries`,
+      url: `${apiUrl}/save-guestbook-entry-sequence.json`,
       contentType: 'application/json; charset=utf-8',
       data: JSON.stringify({
         name,