Follow these steps to set up your Mercury Bank and Slack integration:

1. Log in to your Mercury account at https://mercury.com
2. Navigate to Developer Settings
3. Create a new API key with the following permissions:
   • accounts:read - To read account information
   • transactions:read - To read transaction data
4. Copy your API key for the next step

Set up the following environment variables in Val Town:

1. MERCURY_API_KEY - Your Mercury API key from step 1
2. SLACK_SIGNING_SECRET - You'll get this in step 3

1. Go to https://api.slack.com/apps and click "Create New App"
2. Choose "From scratch" and give your app a name (e.g., "Mercury Bank")
3. Select the workspace where you want to install the app
4. Under "Basic Information", note your "Signing Secret" and add it to Val Town as SLACK_SIGNING_SECRET
5. Under "Slash Commands", create a new command:
   • Command: /mercury
   • Request URL: Your Val Town HTTP endpoint URL (copy from the Val Town UI)
   • Short Description: "Interact with your Mercury bank account"
   • Usage Hint: "[balance|transactions|search] [args]"
6. Under "OAuth & Permissions", add the following scopes:
   • commands - To create slash commands
   • chat:write - To post messages in channels
7. Install the app to your workspace

1. In Slack, try the command /mercury help to see available commands
2. Try /mercury balance to see your account balances
3. Try /mercury transactions 5 to see your 5 most recent transactions

• If you see "An unexpected error occurred", check your Val Town logs for details
• Ensure your Mercury API key has the correct permissions
• Verify that your Slack app is properly configured with the correct URL

• Your Mercury API key has access to sensitive financial data. Keep it secure.
• Consider implementing additional authentication if multiple users will access this integration.
• For production use, implement proper request signature verification from Slack.