Model/Api.php
public function sendWebHook($message)
    {
        $url = $this->config->getIncomingWebhookURL();
        $messagePrefix = $this->config->getWebhookMessagePrefix();
        $currentUsername = 'System';
        try {
            if ($this->state->getAreaCode() == 'adminhtml') {
                $getUser = $this->authSession->getUser();
                if (!empty($getUser)) {
                    $currentUsername = $getUser->getUserName();
                }
            }
        } catch (\Exception $e) {
            $this->log->log(100, 'Failed to retrieve Area Code');
        }

        $storeName = $this->helper->getStoreName();
        $storeUrl = $this->helper->getStoreUrl();

        $text =  $messagePrefix.' user='.$currentUsername.' '.$message.' on <'.$storeUrl.'|Store> | '.$storeName;

        $headers = [
            'Content-type: application/json'
        ];

        $body = json_encode([
            "text"  =>  $text,
            "username" => "fastly-magento-bot",
            "icon_emoji"=> ":airplane:"
        ]);

        $client = $this->curlFactory->create();
        $client->addOption(CURLOPT_CONNECTTIMEOUT, 2);
        $client->addOption(CURLOPT_TIMEOUT, 3);
        $client->write(\Zend_Http_Client::POST, $url, '1.1', $headers, $body);
        $response = $client->read();
        $responseCode = \Zend_Http_Response::extractCode($response);

        if ($responseCode != 200) {
            $this->log->log(100, 'Failed to send message to the following Webhook: '.$url);
        }

        $client->close();
    }
public function sendWebHook($message)
    {
        $url = $this->config->getIncomingWebhookURL();
        $messagePrefix = $this->config->getWebhookMessagePrefix();
        $currentUsername = 'System';
        try {
            if ($this->state->getAreaCode() == 'adminhtml') {
                $getUser = $this->authSession->getUser();
                if (!empty($getUser)) {
                    $currentUsername = $getUser->getUserName();
                }
            }
        } catch (\Exception $e) {
            $this->log->log(100, 'Failed to retrieve Area Code');
        }

        $storeName = $this->helper->getStoreName();
        $storeUrl = $this->helper->getStoreUrl();

        $text =  $messagePrefix.' user='.$currentUsername.' '.$message.' on <'.$storeUrl.'|Store> | '.$storeName;

        $headers = [
            'Content-type: application/json'
        ];

        $body = json_encode([
            "text"  =>  $text,
            "username" => "fastly-magento-bot",
            "icon_emoji"=> ":airplane:"
        ]);

        $client = $this->curlFactory->create();
        $client->addOption(CURLOPT_CONNECTTIMEOUT, 2);
        $client->addOption(CURLOPT_TIMEOUT, 3);
        $client->write(\Zend_Http_Client::POST, $url, '1.1', $headers, $body);
        $response = $client->read();
        $responseCode = \Zend_Http_Response::extractCode($response);

        if ($responseCode != 200) {
            $this->log->log(100, 'Failed to send message to the following Webhook: '.$url);
        }

        $client->close();
    }
Send message to Slack channel

@param $message