Jenkins Glip webhook notification

webhook.groovy

def glip(java.util.LinkedHashMap params) {
    def payload = [
       activity: params.activity,
       title: params.title,
       icon: params.icon,
       body: params.body
    ]
    httpRequest(
      acceptType: 'APPLICATION_JSON',
      contentType: 'APPLICATION_JSON',
      httpMode: 'POST',
      requestBody: groovy.json.JsonOutput.toJson(payload),
      url: params.webhookUrl
    )
}