### **User description**

## Description

fix typo in `coolDownPeriod` json tag. 
renaming it to `cooldownPeriod`
## Related Issue
Parent task: https://tyktech.atlassian.net/browse/TT-11966
Sub task: https://tyktech.atlassian.net/browse/TT-12064

## Motivation and Context

<!-- Why is this change required? What problem does it solve? -->

## How This Has Been Tested

<!-- Please describe in detail how you tested your changes -->
<!-- Include details of your testing environment, and the tests -->
<!-- you ran to see how your change affects other areas of the code,
etc. -->
<!-- This information is helpful for reviewers and QA. -->

## Screenshots (if appropriate)

## Types of changes

<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Refactoring or add test (improvements in base code or adds test
coverage to functionality)

## Checklist

<!-- Go over all the following points, and put an `x` in all the boxes
that apply -->
<!-- If there are no documentation updates required, mark the item as
checked. -->
<!-- Raise up any additional concerns not covered by the checklist. -->

- [ ] I ensured that the documentation is up to date
- [ ] I explained why this PR updates go.mod in detail with reasoning
why it's required
- [ ] I would like a code coverage CI quality gate exception and have
explained why


___

### **PR Type**
Bug fix


___

### **Description**
- Updated the field name from `coolDownPeriod` to `cooldownPeriod` in
both Go struct and JSON schema to maintain consistency and correct a
typo.
- Modified the required fields in the JSON schema to align with the
updated field name.


___



### **Changes walkthrough** 📝
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Bug
fix</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>event.go</strong><dd><code>Update Field Names in
WebhookEvent Struct</code>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
</dd></summary>
<hr>

apidef/oas/event.go
<li>Changed the JSON and BSON field names from
<code>coolDownPeriod</code> to <br><code>cooldownPeriod</code>.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6266/files#diff-528a9f5b311ff21c0b3a9b273e61398209ca8b51550327e4d437bba81e49d577">+1/-1</a>&nbsp;
&nbsp; &nbsp; </td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>x-tyk-api-gateway.json</strong><dd><code>Update JSON
Schema for API Gateway</code>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </dd></summary>
<hr>

apidef/oas/schema/x-tyk-api-gateway.json
<li>Updated the field name in JSON schema from
<code>coolDownPeriod</code> to <br><code>cooldownPeriod</code>.<br> <li>
Adjusted the required fields list to reflect the new field name.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6266/files#diff-78828969c0c04cc1a776dfc93a8bad3c499a8c83e6169f83e96d090bed3e7dd0">+4/-4</a>&nbsp;
&nbsp; &nbsp; </td>
</tr>                    
</table></td></tr></tr></tbody></table>

___

> 💡 **PR-Agent usage**:
>Comment `/help` on the PR to get a list of all available PR-Agent tools
and their descriptions