Handle GDPR data deletion requests with Slack

This workflow automatically deletes user data from different apps/services when a specific slash command is issued in Slack.

Watch this [talk and demo](https://www.youtube.com/watch?v=jG2aCOF0ICg&t=910s) to learn more about this use case. The demo uses Slack, but [Mattermost is Slack-compatible](https://docs.mattermost.com/developer/integration-faq.htmlwhat-does-slack-compatible-mean), so you can also connect Mattermost in this workflow.


Prerequisites

- Accounts and [credentials](https://docs.n8n.io/integrations/credentials/) for the apps/services you want to use. - Some basic knowledge of JavaScript.

Nodes

- [Webhook node](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.webhook/) triggers the workflow when a [Slack slash command](https://slack.com/intl/en-gb/help/articles/360001623607-Create-commands-for-Slack-apps) is issued. - [IF nodes](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.if/) confirm Slack's verification token and verify that the data has the expected format. - [Set node](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.set/) simplifies the payload. - [Switch node](https://docs.n8n.io/nodes/n8n-nodes-base.switch/) chooses the correct path for the operation to perform. - [Respond to Webhook nodes](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.respondToWebhook/) send responses back to Slack. - [Execute Workflow nodes](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.executeWorkflow/) call sub-workflows tailored to deleting data from each individual service. - [Function node](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.function/), [Crypto node](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.crypto/), and [Airtable node](https://docs.n8n.io/integrations/nodes/n8n-nodes-base.airtable/) generate and store a log entry containing a hash value. - [HTTP Request node](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.httpRequest/) sends the final response back to Slack.