What the assistant can create

The integration prepares a new sales invoice draft, plus a linked part-exchange purchase invoice and payment receipt when you supply those details. DealerSlip checks the format of the submitted values and calculates the sale total, net part-exchange credit, recorded payments and balance.

It does not look up a vehicle, verify payment, decide the tax treatment or check your facts. Supply the real details and the tax option you have confirmed for the sale. The assistant should ask for anything missing.

Connect once. Use it for each new deal.

Add this remote MCP server to your assistant. DealerSlip does not require an API key for this standalone workflow.

https://dealerslip.com/mcp

Claude

Open your connector settings, choose Add custom connector, name it DealerSlip and enter the server URL above. Enable DealerSlip in the conversation where you want to create an invoice. Workspace administrators may control which connectors are available.

Claude’s current custom connector instructions

ChatGPT and other assistants

Use the remote MCP connection option available in your assistant. For ChatGPT, custom connections depend on the account’s developer features and workspace permissions. Add the same URL using no authentication where that option is available. This is a custom connection, not an automatically installed app or a public directory listing.

OpenAI’s current connection and testing instructions

Start with a clear request

For example, after connecting DealerSlip:

“Use DealerSlip to prepare a vehicle sales invoice. Ask me for the dealership, buyer, vehicle, invoice reference and date, price and confirmed tax treatment. Ask whether there are extras, a part exchange, finance or payments already received. Then give me the private invoice review link.”

Use full dates when you know them, for example 01/09/2023. Keep the vehicle price, part-exchange allowance, finance settlement and payments separate. Do not ask the assistant to invent missing contact details, payment confirmations or warranty wording.

Review, download and keep a copy

  1. Open the private review link. Check the registration, customer, dealership details and calculated balance.
  2. Read every PDF page. Confirm any part exchange, payments, tax option and terms match the agreed sale.
  3. Ask for corrections when needed. Your assistant can prepare a replacement draft from the corrected details.
  4. Download the document pack. Keep a copy in your sale records and share the PDF through your usual process.

Your saved workspace stays separate

This connection creates new standalone drafts. It cannot read your saved invoices or customer records, sign into your account, send invoices or save a draft to your cloud workspace. There is no automatic invoice numbering across conversations: give it the reference you intend to use.

The assistant and DealerSlip process the details you submit. DealerSlip does not store these drafts in its database. The review link contains the invoice details in its private fragment; anyone with the complete link can open it. Keep it private. The review page removes that fragment from the address and loads no analytics. Refreshing clears the page, so reopen the original assistant link if needed. See our privacy information.

For developers

Import the OpenAPI specification into your assistant or API client. Requests use the caller's own assistant; DealerSlip does not run or bill for an AI model.

The server exposes one tool, create_invoice, over MCP Streamable HTTP. A matching JSON endpoint accepts POST /api/v1/invoices; the input schema lists the fields, limits and required values. No cookies, account tokens or customer-record access are used.

POST https://dealerslip.com/api/v1/invoices
Content-Type: application/json

{
  "ref": "EXAMPLE-001",
  "date": "2026-09-06",
  "seller": {"name": "Example Motors", "address": "Example address"},
  "customer": "Example Customer",
  "address": "Example customer address",
  "registration": "AB12 CDE",
  "make": "Ford",
  "model": "Fiesta",
  "price": 8995,
  "tax": "none"
}

Fictional input showing the format only. The tax option is not a recommendation for your transaction.

The response contains the normalized draft, calculated totals and review_url. Open that link for browser-generated PDFs. The endpoint does not return a stored PDF or issue the invoice. Respect HTTP 429 responses and retry later; service limits apply.