Slack is the leading team communication and collaboration platform. Light's Slack integration lets employees submit receipts, approve invoices, and chat with the Light assistant directly in Slack, and...
Last updated Jul 22, 2026 · 2 min read
The Slack integration enables:
To connect Slack:
Light matches Slack users to Light users by email address, so each person's Slack email must match the email on their Light account.
Employees can submit receipts by sending them to the Light app in a direct message:
Receipts are only processed in direct messages with the Light app — files shared in regular channels are not picked up.
You can chat with the Light assistant from Slack:
The assistant can also post messages to Slack channels on your behalf when you ask it to in chat.
When an invoice requires your approval, Light sends you a Slack message with the invoice details and interactive buttons:
Light also sends approval reminders, and supports approving multiple invoices at once from a single message.
Light sends notifications to users as direct messages from the Light app, including:
Notifications are delivered to each user individually based on their matched email address — there is no per-channel notification configuration.
Messages or receipts not processed: Make sure your Slack account email matches the email on your Light account — Light matches users by email. Also make sure you're sending receipts in a direct message with the Light app, not in a channel.
Notifications not appearing: Verify the Slack integration is connected under Settings (gear icon) → Integrations and that Light is still authorized in your Slack workspace.
Integration disconnected: Re-authorize the Slack integration from Settings (gear icon) → Integrations.
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