stackgate.ai
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Billy

Connect Claude, ChatGPT or Cursor to Billy via MCP. Secure read access to contacts, invoices, bills and posted entries — 15 tools, no code.

Manual setup 15 tools

Overview

Connect Billy to give AI clients read access to Danish accounting data: organization details, contacts, sales invoices, purchase bills, products, chart of accounts, postings, and daybook transactions.

Prerequisites

  • A Billy account with API access
  • A stackgate.ai account

Getting credentials

  1. Sign in to stackgate.ai.
  2. Go to My Integrations and open Billy.
  3. In a separate tab, log in to mit.billy.dk.
  4. Go to Settings → Access tokens and click Create access token.
  5. Enter a descriptive name and save the token.
  6. Copy the token and paste it into stackgate.ai, then click Save.

Each access token is tied to one Billy company. To connect another company, create a separate token in that company's Billy account.

Using with AI clients

  • Dedicated endpoint: POST /mcp/billy with a Sanctum bearer token
  • Private gateway: one config for all integrations — use billy__* namespaced tools

See Documentation for HTTP authentication and private gateway setup.

Troubleshooting

  • 422 integration not configured — add your Billy access token in My Integrations.
  • 401 / invalid token — verify the token in mit.billy.dk under Settings → Access tokens; create a new token if it was revoked.
  • 403 during connect — company access tokens cannot list all organizations; stackgate.ai verifies via contacts/accounts instead. If connect still fails, ensure the token was created inside the target company in mit.billy.dk.
  • Multiple companies — one hub connection maps to one Billy company token; use separate tokens per company.
  • Locked organization — if Billy reports the company is locked (isLocked), resolve the issue in mit.billy.dk before retrying.

Available tools

  • get_organization

    Get a Billy organization by ID. Defaults to the connected company when organization_id is omitted.

  • list_organizations

    List Billy organizations accessible to the connected access token.

  • list_contacts

    List contacts (customers and suppliers) in Billy.

  • get_contact

    Get a Billy contact by ID.

  • list_invoices

    List sales invoices in Billy.

  • get_invoice

    Get a Billy sales invoice by ID. Use include to embed line items.

  • list_products

    List products in the Billy product catalog.

  • get_product

    Get a Billy product by ID.

  • list_bills

    List purchase bills in Billy.

  • get_bill

    Get a Billy purchase bill by ID. Use include to embed line items.

  • list_accounts

    List accounts in the Billy chart of accounts.

  • get_account

    Get a Billy account by ID.

  • list_postings

    List posted ledger entries in Billy for a date range.

  • list_daybook_transactions

    List daybook transactions (vouchers) in Billy.

  • get_daybook_transaction

    Get a Billy daybook transaction by ID. Use include to embed lines.

MCP endpoint: https://stackgate.ai/mcp/billy (HTTP) or via the private gateway.

Related workflows

Multi-integration playbooks that use Billy to solve concrete business outcomes.

Create account Documentation