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In order for this to be possible, you need the following things:

1. Create a SIL script.
2. Configure a webhook to run that SIL script.

Creating a SIL script

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//getting the REST/HTTP call input parameters:
WebhookPayload httpRequestPayload = getWebhookPayload();

//getting the used HTTP method:
string httpMethod = httpRequestPayload.httpMethod;//This can be something like "GET", "POST", "PUT" etc.

//getting the http request payload (body):
string httpPayload = httpRequestPayload.payload;

//getting the http query parameters:
WebhookParam[] httpQueryParams = httpRequestPayload.queryParams;
string firstQueryParamName = httpQueryParams[0].name;
string firstQueryParamValue = httpQueryParams[0].values[0];

//sending the response back to the caller:
appendToWebhookResponse("http method:");
appendToWebhookResponse(httpMethod);
appendToWebhookResponse("payload:");
appendToWebhookResponse(httpPayload);
appendToWebhookResponse("firstQueryParamName:");
appendToWebhookResponse(firstQueryParamName);
appendToWebhookResponse("firstQueryParamValue:");
appendToWebhookResponse(firstQueryParamValue);

//returning a custom HTTP status code:
return true, 1234200;

The format for the return line. If used, it should return <true|false>[, <Custom HTTP <HTTP status code>];
The first argument can only have the 'true' or 'false' values. 'True' means that the script was run correctly, and 'false' means that the script encountered a problem when it was run.

Webhooks configuration

To define what URI and HTTP method(s) will be used to invoke a specific SIL™ script, use the SIL Webhooks configuration.

1. Log in to your Jira as Admin.
2. Go to your Administration > Add-ons > CPRIME PLUGINS CONFIGURATION > SIL Webhooks Configuration.
3. To create a Webhook entry, click the the Add webhook button.
   A screen like the following will appear:
   
   
   
   
4. Fill in the parameters in the form:
   • Name - the name of the webhook. This will be used as an identifier for the webhook configuration.
   • Methods - the HTTP method (or methods) to bind the webhook to.
   • Script - SIL™ script that will run when calling this webhook.
   • Synchronized - the sync/async configuration for the webhook.

   Note
   title NOTE
   The difference between synchronous and asynchronous is that the asynchronous Webhook SIL call can't return any results or custom HTTP codes to the caller. This happens because the SIL script run task is added to a list of future tasks to be run, and the HTTP call ends. With the synchronous option, the call will block until the SIL script run is completed, and the results will be returned to the caller.

   
   

5. Save the configuration.
   After you save  the configuration, a new entry like the following one will show up:
   
   
   
   The URI column in the table will help you run your newly created webhook. For example if your Jira installation instance is located at http://localhost, you can run the webhook using the  http://localhost/rest/keplerrominfo/refapp/latest/webhooks/mysilwebhook/run address with the selected HTTP method(s).

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If you configured the Webhook to be available for the GET HTTP method, you can test the webhook in the browser, giving it custom query parameters, and the result could look something like this (the above SIL script was used):

Webhooks authentication

For the REST/HTTP client to be able to make any Webhooks calls, it needs to be authenticated into the Jira / Confluence instance.

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