Show one invoice, quote or receipt as the document itself. When the result has a second content block, it is the document as copy-ready plain text (title, business, billed to, dates, one line per item, the totals as printed, notes, payment terms and details, or on a receipt the day paid and the method) to paste into an email or a chat, and hosts that draw MCP Apps show the page with a Copy button. A paid invoice shows as its receipt, and each payment has its own numbered receipt (the receipt_number invoice_payment_record answers, for example RCT-2026-001), shown by that number or the payment id. Pass id or number (exactly one, from invoice_list, quote_list or invoice_payment_list); kind 'invoice', 'quote' or 'receipt' is optional (else invoice first, then quote, then receipt). It sends nothing and makes no link. Refusals: unknown id or number NOT_FOUND (a removed payment's receipt: reason_code SIMPLER_SALES_RECEIPT_VOID); a missing or doubled id/number or another argument VALIDATION_ERROR; kind 'receipt' before receipts are set up SERVICE_UNAVAILABLE SIMPLER_SALES_RECEIPT_UNMIGRATED; stylesheet unreadable SERVICE_UNAVAILABLE SIMPLER_SALES_DOCUMENT_CHAT_ASSETS_UNAVAILABLE (retry_after); not read within 3 seconds SERVICE_UNAVAILABLE SIMPLER_SALES_DOCUMENT_SHOW_SLOW (call again after retry_after). Read-only tokens and viewers may call it. Free.