match_expl.bal

    //Method that accepts intent verification requests
    onVerifyIntent (endpoint client, http:Request request) {
        //Build the response for the subscription intent verification request that was received
        var subscriptionVerificationResponse = websub:buildSubscriptionVerificationResponse(request);
        http:Response response = {};
        match (subscriptionVerificationResponse) {
            //Intent verification request was responded to successfully
            http:Response httpResponse => {
                log:printInfo("Intent verified for subscription request");
                response = httpResponse;
            }
            //Error occurred responding to the intent verification request 
            null => {
                log:printInfo("Intent verification for subscription request denied");
                response = { statusCode:404 };
            }
        }
        _ = client -> respond(response);
    }

    //Method that accepts content delivery requests
    onNotification (endpoint client, http:Request request) {
        http:Response response = { statusCode:202 };
        _ = client -> respond(response);
        var reqPayload = request.getJsonPayload();
        match (reqPayload) {
            //JSON payload retrieval from the request was successful
            json jsonPayload => { log:printInfo("WebSub Notification Received: " + jsonPayload.toString()); }
            //An error occurred attempting retrieval of the JSON payload from the request
            mime:EntityError => { log:printInfo("Error occurred processing WebSub Notification"); }
        }
    }