## **User description**
<!-- Provide a general summary of your changes in the Title above -->

## Description

Fix custom plugins contract in OAS API definition to remove unnecessary
nesting.

## Related Issue
Parent: https://tyktech.atlassian.net/browse/TT-11439
Subtask: https://tyktech.atlassian.net/browse/TT-11452

## Motivation and Context

At the moment the Plugins configuration at API level follows this
structure:

```
responsePlugin: 
  plugins:
    - enabled: true
      functionName: ...
```

Same happens for: `responsePlugin`, `prePlugin`, `postPlugin`,
`postAuthenticationPlugin` sections.

Having a `plugins` subsection doesn’t make sense at this point as there
aren’t multiple options, so this PR removes the `plugins` structure and
use the array of plugins directly in the main section, like:
```
responsePlugins:
  - enabled true
    ....
```
Also all the plugin sections should be using plural: i.e
`responsePlugins`, `prePlugins`, `postPlugins`,
`postAuthenticationPlugins`.
This PR adds these fields alongside maintaining `responsePlugin`,
`prePlugin`, `postPlugin`, `postAuthenticationPlugin` with a deprecated
note, for backwards compatibility. This also provides an opportunity to
do the migration in memory without doing hard storage level migrations.

## 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


___

## **Type**
enhancement, bug_fix


___

## **Description**
- Deprecated singular custom plugin configurations (`PrePlugin`,
`PostAuthenticationPlugin`, `PostPlugin`, `ResponsePlugin`) in favor of
plural forms (`PrePlugins`, `PostAuthenticationPlugins`, `PostPlugins`,
`ResponsePlugins`) to remove unnecessary nesting and align with the
structure of having multiple plugins directly under their respective
sections.
- Added new plural fields for custom plugins configuration, allowing for
a more intuitive and streamlined configuration structure.
- Updated `Fill` and `ExtractTo` methods in `middleware.go` to support
both singular and plural plugin configurations, ensuring backward
compatibility.
- Introduced new schema definitions in `x-tyk-api-gateway.json` for the
plural forms of custom plugins configurations and marked the singular
forms as deprecated.
- Added and updated tests in `middleware_test.go` and `oas_test.go` to
validate the migration from singular to plural plugin configurations.


___



## **Changes walkthrough**
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware.go</strong><dd><code>Refactor Custom Plugins
Configuration to Support Plural Forms</code></dd></summary>
<hr>

apidef/oas/middleware.go
<li>Deprecated <code>PrePlugin</code>,
<code>PostAuthenticationPlugin</code>, <code>PostPlugin</code>, and
<br><code>ResponsePlugin</code> in favor of plural forms.<br> <li> Added
new plural fields <code>PrePlugins</code>,
<code>PostAuthenticationPlugins</code>, <br><code>PostPlugins</code>,
and <code>ResponsePlugins</code> for custom plugins configuration.<br>
<li> Updated <code>Fill</code> and <code>ExtractTo</code> methods to
support both singular and plural <br>plugin configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-992ec7c28d25fd54f6491d295389757705cd114bc869a35cba50d42e548cdc6e">+91/-51</a>&nbsp;
</td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>x-tyk-api-gateway.json</strong><dd><code>Schema Update
to Support Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/schema/x-tyk-api-gateway.json
<li>Introduced new schema definitions for plural custom plugins
<br>configurations.<br> <li> Deprecated singular custom plugin
configurations in favor of plural <br>forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-78828969c0c04cc1a776dfc93a8bad3c499a8c83e6169f83e96d090bed3e7dd0">+20/-0</a>&nbsp;
&nbsp; </td>
</tr>                    
</table></td></tr><tr><td><strong>Tests</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware_test.go</strong><dd><code>Add Tests for
Plural Custom Plugins Configuration</code>&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; </dd></summary>
<hr>

apidef/oas/middleware_test.go
<li>Added tests to validate the migration from singular to plural plugin
<br>configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-0af31cb29ae298a6ac3e402b283ab364a6fd793fd04f253ef7c4983234c17bef">+46/-0</a>&nbsp;
&nbsp; </td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>oas_test.go</strong><dd><code>Update Tests to Support
Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/oas_test.go
<li>Updated tests to reflect changes in custom plugins configuration
from <br>singular to plural forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-74029ee88132d30d6478c96a35f8bb2200e0c8e6f42f2c9b147dc6bb7ce74644">+28/-32</a>&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

(cherry picked from commit 4cddc45)

…ct (#6097)

[TT-11439/TT-11452] fix custom plugins contract (#6097)

## **User description**
<!-- Provide a general summary of your changes in the Title above -->

## Description

Fix custom plugins contract in OAS API definition to remove unnecessary
nesting.

## Related Issue
Parent: https://tyktech.atlassian.net/browse/TT-11439
Subtask: https://tyktech.atlassian.net/browse/TT-11452

## Motivation and Context

At the moment the Plugins configuration at API level follows this
structure:

```
responsePlugin: 
  plugins:
    - enabled: true
      functionName: ...
```

Same happens for: `responsePlugin`, `prePlugin`, `postPlugin`,
`postAuthenticationPlugin` sections.

Having a `plugins` subsection doesn’t make sense at this point as there
aren’t multiple options, so this PR removes the `plugins` structure and
use the array of plugins directly in the main section, like:
```
responsePlugins:
  - enabled true
    ....
```
Also all the plugin sections should be using plural: i.e
`responsePlugins`, `prePlugins`, `postPlugins`,
`postAuthenticationPlugins`.
This PR adds these fields alongside maintaining `responsePlugin`,
`prePlugin`, `postPlugin`, `postAuthenticationPlugin` with a deprecated
note, for backwards compatibility. This also provides an opportunity to
do the migration in memory without doing hard storage level migrations.

## 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


___

## **Type**
enhancement, bug_fix


___

## **Description**
- Deprecated singular custom plugin configurations (`PrePlugin`,
`PostAuthenticationPlugin`, `PostPlugin`, `ResponsePlugin`) in favor of
plural forms (`PrePlugins`, `PostAuthenticationPlugins`, `PostPlugins`,
`ResponsePlugins`) to remove unnecessary nesting and align with the
structure of having multiple plugins directly under their respective
sections.
- Added new plural fields for custom plugins configuration, allowing for
a more intuitive and streamlined configuration structure.
- Updated `Fill` and `ExtractTo` methods in `middleware.go` to support
both singular and plural plugin configurations, ensuring backward
compatibility.
- Introduced new schema definitions in `x-tyk-api-gateway.json` for the
plural forms of custom plugins configurations and marked the singular
forms as deprecated.
- Added and updated tests in `middleware_test.go` and `oas_test.go` to
validate the migration from singular to plural plugin configurations.


___



## **Changes walkthrough**
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware.go</strong><dd><code>Refactor Custom Plugins
Configuration to Support Plural Forms</code></dd></summary>
<hr>

apidef/oas/middleware.go
<li>Deprecated <code>PrePlugin</code>,
<code>PostAuthenticationPlugin</code>, <code>PostPlugin</code>, and
<br><code>ResponsePlugin</code> in favor of plural forms.<br> <li> Added
new plural fields <code>PrePlugins</code>,
<code>PostAuthenticationPlugins</code>, <br><code>PostPlugins</code>,
and <code>ResponsePlugins</code> for custom plugins configuration.<br>
<li> Updated <code>Fill</code> and <code>ExtractTo</code> methods to
support both singular and plural <br>plugin configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-992ec7c28d25fd54f6491d295389757705cd114bc869a35cba50d42e548cdc6e">+91/-51</a>&nbsp;
</td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>x-tyk-api-gateway.json</strong><dd><code>Schema Update
to Support Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/schema/x-tyk-api-gateway.json
<li>Introduced new schema definitions for plural custom plugins
<br>configurations.<br> <li> Deprecated singular custom plugin
configurations in favor of plural <br>forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-78828969c0c04cc1a776dfc93a8bad3c499a8c83e6169f83e96d090bed3e7dd0">+20/-0</a>&nbsp;
&nbsp; </td>
</tr>                    
</table></td></tr><tr><td><strong>Tests</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware_test.go</strong><dd><code>Add Tests for
Plural Custom Plugins Configuration</code>&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; </dd></summary>
<hr>

apidef/oas/middleware_test.go
<li>Added tests to validate the migration from singular to plural plugin
<br>configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-0af31cb29ae298a6ac3e402b283ab364a6fd793fd04f253ef7c4983234c17bef">+46/-0</a>&nbsp;
&nbsp; </td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>oas_test.go</strong><dd><code>Update Tests to Support
Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/oas_test.go
<li>Updated tests to reflect changes in custom plugins configuration
from <br>singular to plural forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-74029ee88132d30d6478c96a35f8bb2200e0c8e6f42f2c9b147dc6bb7ce74644">+28/-32</a>&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

## **User description**
<!-- Provide a general summary of your changes in the Title above -->

## Description

Fix custom plugins contract in OAS API definition to remove unnecessary
nesting.

## Related Issue
Parent: https://tyktech.atlassian.net/browse/TT-11439
Subtask: https://tyktech.atlassian.net/browse/TT-11452

## Motivation and Context

At the moment the Plugins configuration at API level follows this
structure:

```
responsePlugin: 
  plugins:
    - enabled: true
      functionName: ...
```

Same happens for: `responsePlugin`, `prePlugin`, `postPlugin`,
`postAuthenticationPlugin` sections.

Having a `plugins` subsection doesn’t make sense at this point as there
aren’t multiple options, so this PR removes the `plugins` structure and
use the array of plugins directly in the main section, like:
```
responsePlugins:
  - enabled true
    ....
```
Also all the plugin sections should be using plural: i.e
`responsePlugins`, `prePlugins`, `postPlugins`,
`postAuthenticationPlugins`.
This PR adds these fields alongside maintaining `responsePlugin`,
`prePlugin`, `postPlugin`, `postAuthenticationPlugin` with a deprecated
note, for backwards compatibility. This also provides an opportunity to
do the migration in memory without doing hard storage level migrations.

## 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


___

## **Type**
enhancement, bug_fix


___

## **Description**
- Deprecated singular custom plugin configurations (`PrePlugin`,
`PostAuthenticationPlugin`, `PostPlugin`, `ResponsePlugin`) in favor of
plural forms (`PrePlugins`, `PostAuthenticationPlugins`, `PostPlugins`,
`ResponsePlugins`) to remove unnecessary nesting and align with the
structure of having multiple plugins directly under their respective
sections.
- Added new plural fields for custom plugins configuration, allowing for
a more intuitive and streamlined configuration structure.
- Updated `Fill` and `ExtractTo` methods in `middleware.go` to support
both singular and plural plugin configurations, ensuring backward
compatibility.
- Introduced new schema definitions in `x-tyk-api-gateway.json` for the
plural forms of custom plugins configurations and marked the singular
forms as deprecated.
- Added and updated tests in `middleware_test.go` and `oas_test.go` to
validate the migration from singular to plural plugin configurations.


___



## **Changes walkthrough**
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware.go</strong><dd><code>Refactor Custom Plugins
Configuration to Support Plural Forms</code></dd></summary>
<hr>

apidef/oas/middleware.go
<li>Deprecated <code>PrePlugin</code>,
<code>PostAuthenticationPlugin</code>, <code>PostPlugin</code>, and
<br><code>ResponsePlugin</code> in favor of plural forms.<br> <li> Added
new plural fields <code>PrePlugins</code>,
<code>PostAuthenticationPlugins</code>, <br><code>PostPlugins</code>,
and <code>ResponsePlugins</code> for custom plugins configuration.<br>
<li> Updated <code>Fill</code> and <code>ExtractTo</code> methods to
support both singular and plural <br>plugin configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-992ec7c28d25fd54f6491d295389757705cd114bc869a35cba50d42e548cdc6e">+91/-51</a>&nbsp;
</td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>x-tyk-api-gateway.json</strong><dd><code>Schema Update
to Support Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/schema/x-tyk-api-gateway.json
<li>Introduced new schema definitions for plural custom plugins
<br>configurations.<br> <li> Deprecated singular custom plugin
configurations in favor of plural <br>forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-78828969c0c04cc1a776dfc93a8bad3c499a8c83e6169f83e96d090bed3e7dd0">+20/-0</a>&nbsp;
&nbsp; </td>
</tr>                    
</table></td></tr><tr><td><strong>Tests</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware_test.go</strong><dd><code>Add Tests for
Plural Custom Plugins Configuration</code>&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; </dd></summary>
<hr>

apidef/oas/middleware_test.go
<li>Added tests to validate the migration from singular to plural plugin
<br>configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-0af31cb29ae298a6ac3e402b283ab364a6fd793fd04f253ef7c4983234c17bef">+46/-0</a>&nbsp;
&nbsp; </td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>oas_test.go</strong><dd><code>Update Tests to Support
Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/oas_test.go
<li>Updated tests to reflect changes in custom plugins configuration
from <br>singular to plural forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-74029ee88132d30d6478c96a35f8bb2200e0c8e6f42f2c9b147dc6bb7ce74644">+28/-32</a>&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

(cherry picked from commit 4cddc45)

…ract (#6097)

[TT-11439/TT-11452] fix custom plugins contract (#6097)

## **User description**
<!-- Provide a general summary of your changes in the Title above -->

## Description

Fix custom plugins contract in OAS API definition to remove unnecessary
nesting.

## Related Issue
Parent: https://tyktech.atlassian.net/browse/TT-11439
Subtask: https://tyktech.atlassian.net/browse/TT-11452

## Motivation and Context

At the moment the Plugins configuration at API level follows this
structure:

```
responsePlugin: 
  plugins:
    - enabled: true
      functionName: ...
```

Same happens for: `responsePlugin`, `prePlugin`, `postPlugin`,
`postAuthenticationPlugin` sections.

Having a `plugins` subsection doesn’t make sense at this point as there
aren’t multiple options, so this PR removes the `plugins` structure and
use the array of plugins directly in the main section, like:
```
responsePlugins:
  - enabled true
    ....
```
Also all the plugin sections should be using plural: i.e
`responsePlugins`, `prePlugins`, `postPlugins`,
`postAuthenticationPlugins`.
This PR adds these fields alongside maintaining `responsePlugin`,
`prePlugin`, `postPlugin`, `postAuthenticationPlugin` with a deprecated
note, for backwards compatibility. This also provides an opportunity to
do the migration in memory without doing hard storage level migrations.

## 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


___

## **Type**
enhancement, bug_fix


___

## **Description**
- Deprecated singular custom plugin configurations (`PrePlugin`,
`PostAuthenticationPlugin`, `PostPlugin`, `ResponsePlugin`) in favor of
plural forms (`PrePlugins`, `PostAuthenticationPlugins`, `PostPlugins`,
`ResponsePlugins`) to remove unnecessary nesting and align with the
structure of having multiple plugins directly under their respective
sections.
- Added new plural fields for custom plugins configuration, allowing for
a more intuitive and streamlined configuration structure.
- Updated `Fill` and `ExtractTo` methods in `middleware.go` to support
both singular and plural plugin configurations, ensuring backward
compatibility.
- Introduced new schema definitions in `x-tyk-api-gateway.json` for the
plural forms of custom plugins configurations and marked the singular
forms as deprecated.
- Added and updated tests in `middleware_test.go` and `oas_test.go` to
validate the migration from singular to plural plugin configurations.


___



## **Changes walkthrough**
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware.go</strong><dd><code>Refactor Custom Plugins
Configuration to Support Plural Forms</code></dd></summary>
<hr>

apidef/oas/middleware.go
<li>Deprecated <code>PrePlugin</code>,
<code>PostAuthenticationPlugin</code>, <code>PostPlugin</code>, and
<br><code>ResponsePlugin</code> in favor of plural forms.<br> <li> Added
new plural fields <code>PrePlugins</code>,
<code>PostAuthenticationPlugins</code>, <br><code>PostPlugins</code>,
and <code>ResponsePlugins</code> for custom plugins configuration.<br>
<li> Updated <code>Fill</code> and <code>ExtractTo</code> methods to
support both singular and plural <br>plugin configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-992ec7c28d25fd54f6491d295389757705cd114bc869a35cba50d42e548cdc6e">+91/-51</a>&nbsp;
</td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>x-tyk-api-gateway.json</strong><dd><code>Schema Update
to Support Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/schema/x-tyk-api-gateway.json
<li>Introduced new schema definitions for plural custom plugins
<br>configurations.<br> <li> Deprecated singular custom plugin
configurations in favor of plural <br>forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-78828969c0c04cc1a776dfc93a8bad3c499a8c83e6169f83e96d090bed3e7dd0">+20/-0</a>&nbsp;
&nbsp; </td>
</tr>                    
</table></td></tr><tr><td><strong>Tests</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>middleware_test.go</strong><dd><code>Add Tests for
Plural Custom Plugins Configuration</code>&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; </dd></summary>
<hr>

apidef/oas/middleware_test.go
<li>Added tests to validate the migration from singular to plural plugin
<br>configurations.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-0af31cb29ae298a6ac3e402b283ab364a6fd793fd04f253ef7c4983234c17bef">+46/-0</a>&nbsp;
&nbsp; </td>
</tr>                    

<tr>
  <td>
    <details>
<summary><strong>oas_test.go</strong><dd><code>Update Tests to Support
Plural Custom Plugins Configuration</code></dd></summary>
<hr>

apidef/oas/oas_test.go
<li>Updated tests to reflect changes in custom plugins configuration
from <br>singular to plural forms.


</details>
    

  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6097/files#diff-74029ee88132d30d6478c96a35f8bb2200e0c8e6f42f2c9b147dc6bb7ce74644">+28/-32</a>&nbsp;
</td>
</tr>                    
</table></td></tr></tr></tbody></table>

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