Short answer
ChatGPT can write an invoice from details you type, but for a service business the money is in what it can find: completed jobs that were never invoiced, invoices past due and quotes that went quiet. Connected to Fieldproxy through MCP, ChatGPT or Claude reads live jobs and invoices, reports accounts-receivable ageing, drafts overdue reminders and generates estimates and PDF documents, sending messages only after you confirm.
The three questions worth asking every week
- "Which jobs did we complete last month that have no invoice?"
- "Which customers are more than 60 days overdue? Draft a polite reminder for each."
- "Which quotes over $5,000 have had no follow-up in two weeks?"
Generating the documents
Fieldproxy's document tools preview and issue proposals, generate estimates and create PDF documents from your templates, so the invoice or quote carries your real line items and rates rather than numbers retyped into a chat.
Keeping it safe
Reminders are drafted first and sent only after you confirm, from your own mailbox, at most 20 an hour per key and inside your quiet hours. Every call is logged.
Fieldproxy facts on this page come from the Fieldproxy MCP reference. Competitor details are from each vendor's own documentation as of September 27, 2026; see the comparison table and sources.