Claude Code builds invoices with bank matching

Mark van der Eng uses Claude Code to build his own invoicing tool and reports sending that month’s invoices through it. The operational requirements are concrete: branded PDFs, payment QR codes and a copy to his bookkeeper, plus less manual checking of the business bank account.

He imports invoice history back to 2018 before using the new workflow. The running tool watches for payments containing an invoice number in the reference and marks the matching invoice paid. He also adds three reminder levels, from friendly to final notice, in Dutch and English, each initiated with a click.

Claude Code is credited with building the software; the post does not establish that a language-model agent makes each live payment match. The described matching condition depends on a usable invoice reference. No fallback for missing or ambiguous references is shown.

The author characterises the invoices as compliant, but the post supplies no independent legal or accounting audit. This entry therefore records the operational artifact and the author’s actual monthly use, without guaranteeing compliance or universal savings. The useful detail is joining payment status to a stable invoice identifier and importing historical records before replacing an existing workflow. Review of totals, message recipients and exceptional bank references remains necessary for anyone adapting that pattern.

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Source: LinkedIn · Mark van der Eng