lib/createsend/list.rb
def create_webhook(events, url, payload_format)
      options = { :body => {
        :Events => events,
        :Url => url,
        :PayloadFormat => payload_format }.to_json }
      response = post "webhooks", options
      response.parsed_response
    end
def create_webhook(events, url, payload_format)
      options = { :body => {
        :Events => events,
        :Url => url,
        :PayloadFormat => payload_format }.to_json }
      response = post "webhooks", options
      response.parsed_response
    end
Creates a new webhook for the specified events (an array of strings).
 Valid events are "Subscribe", "Deactivate", and "Update".
 Valid payload formats are "json", and "xml".