sfApexClass

public class TriggerSlackWebhook {
    @InvocableMethod(label='Send to Slack' description='Send a message to Slack')
    public static void sendToSlack(List<Request> requests) {
        for (Request req : requests) {
            System.debug('Sending message to Slack: Endpoint=' + req.endpoint + 
                         ', Message=' + req.message + 
                         ', RecordID=' + req.recordId + 
                         ', SlackChannelName=' + req.slackChannelName);
            sendMessage(req.endpoint, req.message, req.recordId, req.slackChannelName);
        }
    }

    @future(callout=true)
    private static void sendMessage(String endpoint, String message, String recordId, String slackChannelName) {
        try {
            HttpRequest req = new HttpRequest();
            req.setEndpoint(endpoint);
            req.setMethod('POST');
            req.setHeader('Content-Type', 'application/json');
            
            // Adjusting payload to meet the Slack expected format
            Map<String, Object> payloadMap = new Map<String, Object>();
            payloadMap.put('recordId', recordId);  // Using recordId as a top-level key
            payloadMap.put('slackChannelName', slackChannelName);  // Correct field name for Slack

            // Optionally include message if needed by your Slack workflow:
            // payloadMap.put('message', message);

            String payload = JSON.serialize(payloadMap);
            System.debug('JSON Payload: ' + payload);

            req.setBody(payload);

            Http http = new Http();
            HttpResponse res = http.send(req);

            // Log the response from Slack
            if (res.getStatusCode() != 200) {
                System.debug('Error sending to Slack: ' + res.getStatus() + '; ' + res.getBody());
            } else {
                System.debug('Message sent successfully to Slack: ' + res.getBody());
            }
        } catch (Exception e) {
            System.debug('Error sending message to Slack: ' + e.getMessage());
        }
    }

    public class Request {
        @InvocableVariable(required=true description='The Slack webhook URL')
        public String endpoint;
        
        @InvocableVariable(required=true description='The message to send to Slack')
        public String message;
        
        @InvocableVariable(required=true description='The record ID')
        public String recordId;

        @InvocableVariable(required=false description='The Slack channel name')
        public String slackChannelName;
    }
}