> 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-single-step-integration/2.-calling-the-external-system.md).
# 2. Calling the External System
**Create the Service Request**
{% hint style="success" %}
A new feature called [**Buildhelper**](/integration-gateway-platform-reference/buildhelper.md) is now available to help creating new Service Requests for various external Systems / APIs with pre-created fields for various request types.
{% endhint %}
Now that the integration has been created, we can begin to add logic to it. For this tutorial, we will simply call the `randomuser` API and receive its response.
Right click on the integration, click *Go To*, then click *Service Request*.
Right click > Go To > Service Request
You will see an empty table.
On the toolbar along the bottom of the screen, click the plus icon (+) to add a new Service Request. This will create a new row in the table, which will be highlighted in green to indicate it was newly created.
Newly created, empty Service Request
We need to fill out three columns on this service request. You may need to scroll your screen to the right to see all of them.
| Column | Value |
| ---------------- | --------------- |
| System | `HTTP` |
| Service Name | `n/a` |
| Formula Variable | `request_users` |
Save your changes by clicking the *Save* icon on the bottom toolbar.
Filled out Service Request
Next, we will create the Field Mappings for this Service Request.
**Create the Field Mappings**
Right click along the service request's row, then click *Go To*, then click *Field Mapping*. You will see an empty table.
{% hint style="info" %}
You can verify that you're on the correct page by checking the *Component* dropdown on the top-left of the page. At this step, it should read "Field Mapping".\
\
{% endhint %}
Create two new field mappings by clicking the plus icon (+) on the bottom toolbar twice. Fill out the first field mapping by entering the following values in the first row:
| Column | Value |
| ---------- | -------- |
| Field | `method` |
| Value | `"GET"` |
| Value Type | `str` |
Then, fill out the second field mapping with the following values:
| Column | Value |
| ---------- | ------------------- |
| Field | `url_path` |
| Value | `"/api/randomuser"` |
| Value Type | `str` |
Two field mappings, method and url_path
Save your changes.
---
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