diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index 37034f93f..ff763e7ec 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -449,13 +449,21 @@ def service_set_inbound_api(service_id):
     form = ServiceInboundApiForm(url=inbound_api.get('url') if inbound_api else '')
 
     if form.validate_on_submit():
-        service_api_client.update_service_inbound_api(
-            service_id,
-            url=form.url.data,
-            bearer_token=form.bearer_token.data,
-            user_id=current_user.id,
-            inbound_api_id=inbound_api.get('id') if inbound_api else ''
-        )
+        if inbound_api:
+            service_api_client.update_service_inbound_api(
+                service_id,
+                url=form.url.data,
+                bearer_token=form.bearer_token.data,
+                user_id=current_user.id,
+                inbound_api_id=inbound_api.get('id') if inbound_api else ''
+            )
+        else:
+            service_api_client.create_service_inbound_api(
+                service_id,
+                url=form.url.data,
+                bearer_token=form.bearer_token.data,
+                user_id=current_user.id
+            )
         return redirect(url_for('.service_settings', service_id=service_id))
 
     return render_template(
diff --git a/app/notify_client/service_api_client.py b/app/notify_client/service_api_client.py
index 70ee891ac..0fa530999 100644
--- a/app/notify_client/service_api_client.py
+++ b/app/notify_client/service_api_client.py
@@ -266,14 +266,21 @@ class ServiceAPIClient(NotifyAdminAPIClient):
             '/service/{}/inbound-sms/summary'.format(service_id)
         )
 
+    def create_service_inbound_api(self, service_id, url, bearer_token, user_id):
+        data = {
+            "url": url,
+            "bearer_token": bearer_token,
+            "updated_by_id": user_id
+        }
+        return self.post("/service/{}/inbound-api".format(service_id), data)
+
     def update_service_inbound_api(self, service_id, url, bearer_token, user_id, inbound_api_id):
         data = {
             "url": url,
             "bearer_token": bearer_token,
             "updated_by_id": user_id
         }
-        update_inbound_api_path = '/{}'.format(inbound_api_id) if inbound_api_id else ''
-        return self.post("/service/{}/inbound-api{}".format(service_id, update_inbound_api_path), data)
+        return self.post("/service/{}/inbound-api/{}".format(service_id, inbound_api_id), data)
 
     def get_service_inbound_api(self, service_id, inbound_sms_api_id):
         return self.get(