To be able to send notifications to Slack you need to follow these steps:

1. Create a Slack App (start building) and generate an incoming webhook using https://api.slack.com/
2. Give the app a name and choose a workspace. 
3. Navigate to Add Features and Functionality > Incoming Webhook > Activate Incoming Webhooks > Add New Webhook to Workspace > Select Channel (if no channel exists, create one) > Allow.
4. Copy Webhook URL to your clipboard: Example: https://hooks.slack.com/services/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
5. Add Slack as Resource in GoAnywhere by navigating to Resources > REST Servers > Add REST Server > Add Webhook URL. Paste the URL in the clipboard and Save.
6. Create a new project by navigating to Workflows >Create a project > Web Services > REST Post > Select the REST Server created in step 5.
7. Add the following content:

   {
    "text": "Test message from GoAnywhere MFT"
   }

8. Save.