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public with sharing class SlackOpportunityPublisher {
private static final String slackURL = 'YOUR_WEBHOOK_URL';
@InvocableMethod(label='Post to Slack')
public static void postToSlack(List<Id> opportunityId) {
Id oppId = opportunityId[0]; // If bulk, only post first to avoid overloading Slack channel
Opportunity opportunity = [SELECT Name, StageName from Opportunity WHERE Id=:oppId];
Map<String,Object> msg = new Map<String,Object>();
msg.put('text', 'The following opportunity has changed:\n' + opportunity.Name + '\nNew Stage: *'
+ opportunity.StageName + '*');
msg.put('mrkdwn', true);
String body = JSON.serialize(msg);
System.enqueueJob(new QueueableSlackCall(slackURL, 'POST', body));
public class QueueableSlackCall implements System.Queueable, Database.AllowsCallouts {
private final String url;
private final String method;
private final String body;
public QueueableSlackCall(String url, String method, String body) {
this.url = url;
this.method = method;
this.body = body;
public void execute(System.QueueableContext ctx) {
HttpRequest req = new HttpRequest();
Http http = new Http();
HttpResponse res = http.send(req);
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