> 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.
Add the adapter for the Sandbox Mock Core
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.*
Add details for the Sandbox Mock Core
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.
New Service Request for the Mock Core
Save your changes.
---
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