Credit Memo
Issue credit notes and purchase orders with automatic tax calculation and document generation.
Create and manage credit notes against invoices with per-line tax handling, and raise purchase orders to suppliers. Generate plain-text summaries or print-ready PDFs. Tracks partial receipts and open orders.
Try asking Muse: "Issue a credit note for returned goods against invoice INV-2026-0001 and email it to the customer."
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Source: Found in the official MCP Registry (io.github.theluckystrike/credit-memo) · First listed October 28, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 3 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://mcp.zovo.one/mcp/credit-noteNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
Credit Memo is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://mcp.zovo.one/mcp/credit-noteWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 760ms. Worked in 100% of checks over 30 days.
Screening · October 28, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 16
credit_note_createCredit one invoice: the whole invoice, a GROSS amount_minor split over its VAT rates, or named lines. Amounts store negative, reusing the invoice's own rates. Free: 5 a month. Send it with credit_note_text.credit_note_listList credit notes newest first: id, invoice, client, basis, reason, currency and the NEGATIVE total, with the amount credited per currency. Filter by invoice, client or issue date range.credit_note_getReturn one credit note in full by id or exact client name: every negated line, VAT lines, totals, the reason, and the invoice number and date it reverses. Reads only. Use credit_note_list for the ids.credit_note_pdfCall this tool to render one credit note as an A4 print-ready document and return a download link valid for one hour: the invoice layout titled CREDIT NOTE, with the invoice it reverses. Pro.credit_note_textTurn a credit note into a plain-text summary to paste into an email: the negated line table, VAT lines, total, reason, and what now comes off the invoice. Also a .txt download link valid one hour. Free; credit_note_pdf writes the A4 document.credit_note_deleteRemove one credit note never posted to its invoice and never rendered, freeing that month's slot; the invoice becomes creditable again. One with a dependent is refused: issue a fresh note to reverse a sent one.purchase_order_createRaise a purchase order to a supplier from items and return its PO number and totals. unit_price is in MAJOR units; currency, VAT and the buyer block come from the shared profile. Free: 5 documents a calendar month.purchase_order_listList purchase orders newest first: id, supplier, order and expected delivery dates, status open, partially_received or received, currency, total and received date. Filter by status, supplier or date range.purchase_order_getReturn one purchase order in full by id or exact supplier name: buyer and supplier blocks, every line with unit price and VAT, totals, the delivery date, status and every receipt with its date and note.purchase_order_pdfCall this tool to render one purchase order as an A4 print-ready document and return a download link valid for one hour: the invoice layout titled PURCHASE ORDER, with the buyer and supplier. Pro.purchase_order_textTurn a purchase order into a plain-text order to paste into an email: the line table, VAT lines, total, and a line asking the supplier to deliver by the date and quote the PO number. Also a .txt download link valid one hour. Free on every tier.purchase_order_receiveRecord that an order arrived. partial keeps it open and can be repeated, each receipt kept with its date and note; a full receipt closes it. An order already received, or a date before the order date, is refused.purchase_order_deleteRemove one purchase order with nothing received and never rendered, freeing that month's slot. One with a receipt is refused, naming it. The PO number is never reissued. purchase_order_receive logs arrivals.billing_docs_reportOver a date range: what was credited back per currency and against how many invoices, what is still on order per currency, and every open order past its delivery date with days late. Pro; the list tools are free.license_statusReport this endpoint's licence state for your token as JSON: the product, the tier free or pro, why it is not Pro, and the checkout URL. Call it to explain a free-tier refusal. No arguments, nothing changes.license_activateTurn Pro on for this connection with key, an MCPL1.<payload>.<signature> issued at checkout for this server or the bundle. Data under your token stays; a wrong or expired key changes nothing. license_status confirms it.Recent checks
Link
https://mcp.zovo.one/mcp/credit-noteQuestions about Credit Memo in Muse
How do I connect Credit Memo to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Credit Memo to help me. It is a free service with an MCP server at https://mcp.zovo.one/mcp/credit-note. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Credit Memo working right now?
At the last check (October 29, 2026, 08:30 UTC) the endpoint was working, answering in 760ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Credit Memo safe to connect to Muse?
It was screened on October 28, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Credit Memo do in Muse?
It exposes 16 tools, including credit_note_create, credit_note_list, credit_note_get, credit_note_pdf. For example, you could ask Muse: "Issue a credit note for returned goods against invoice INV-2026-0001 and email it to the customer."
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