getWebhookPayload

//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, 1234;