> For the complete documentation index, see [llms.txt](https://glyue.docs.sandboxbanking.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://glyue.docs.sandboxbanking.com/tutorials/building-a-multi-system-integration/1.-connecting-to-the-core.md).

# 1. Connecting to the Core

Start by opening the integration we built. Navigate to the **Build page** using the navigation bar.

Right click on your integration and click *Configure*. This will open the *Configuration Wizard* you used when you first created the integration. Click *Continue* to move to the *Systems* page, and click *+ Add System* to add a second adapter to configure our connection to the mock core.

<figure><img src="/files/K9KBrmG3cqupyYyHzkXf" alt=""><figcaption><p>Add the adapter for the Sandbox Mock Core</p></figcaption></figure>

Select *Mockcore* from the dropdown. Beneath it, click on the *Select Adapter Config* dropdown, then click *Add New Adapter*. This will open a popup window.

In the popup window, enter the following:

* Name: `Mock Banking Core`
* Host: `sandbox.demo-systems.sandboxbanking.com`

Leave all other fields bank / as-is and click *Save*, then click *Save Adapter Bindings.*

<figure><img src="/files/NLO18YnyWWWSXsa9bclz" alt=""><figcaption><p>Add details for the Sandbox Mock Core</p></figcaption></figure>

After saving, close the window.

{% hint style="info" %}
The Mock Banking Core is a playground created by Sandbox Banking to represent a banking core within an integration. It can be accessed [here](https://sandbox.demo-systems.sandboxbanking.com).\
\
The Mock Banking Core is useful for visualizing the effect of integrations before Integration Gateway is connected to a real core.
{% endhint %}

Right click on the integration and select *Go To > Service Request*. You should see the service request we already created, with its `Formula Variable` set to `request_users`.

Click *+ Add Row* to create a new service request. Fill out the following columns on the service request:

| Column           | Value                 |
| ---------------- | --------------------- |
| System           | `MOCKCORE`            |
| Service Name     | `n/a`                 |
| Formula Variable | `create_new_customer` |

This service request will communicate with the Mock Core and pass it the data that we will set up in the next step.

<figure><img src="/files/QToCGk2vm39631NPK0xL" alt=""><figcaption><p>New Service Request for the Mock Core</p></figcaption></figure>

Save your changes.


---

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