1. Read the workflow and source
Open the complete free skill and authored Markdown download, its inputs and review gates. Read ChatGPT project documentation for current file, plan and privacy limits. Account access is not tested here.
2. Start with approved reference files
Create a separate conversation or project for this one job. Upload the public Markdown as reference if your account supports files. This is not a plugin installation. Do not mix clients or place credentials and private records into a reusable setup instruction.
3. Run the fictional acceptance test
Fictional usage line records 2,300 units at 0.02 each, which is 46.00: the invoice shows 69.00, implying 3,450 units, a quantity gap of 1,150 to resolve.
4. Use a narrow request
Use the attached Usage Based Invoice Line Recheck and supplied fictional inputs only. Return the output contract, source IDs, original values and unknowns. No retrieval, sign-in, send, share, account change, payment or real decision.
5. Review before real data
Check each source row, unchanged original value, missing fact and arithmetic. A successful fictional result is a readiness check, not proof of real-account compatibility. Only then use authorized minimum-necessary real exports, confirm retention/access and ask the responsible owner to review the result.
Where this guide stops
No sending, sharing, ledger/CRM changes, account sign-in or spending is authorized by this guide. A separate request and the required approval govern real actions. Keep an evidence copy of the input version and reviewed output.
Checked October 20, 2026. Demand lead follows the published workflow topic; exact guide query volume is unmeasured. AI Agent Skills is independent of the named assistant maker.