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Slack notifications are a great way to reach business users with time-sensitive alerts or action items while they’re at work. For many organizations, Slack is the software of choice for business communication. Slack is less suited for notifications outside of a work context or out of working hours. We offer details for developers who are planning to build a Slack integration for their product. The main way to send a message is the POST chat postMessage endpoint, but it’s also possible with other endpoints.