Bills are bills, even during the Regency. Check out Louise Allen‘s post featuring different hand-written bills from the era.
“If you had the money, late Georgian shops were awash with tempting goods. And even if you weren’t so well off, tradesmen would extend credit for considerable periods if your name was good, you were a prominent person or your expectations were favourable. Many a Regency rakehell kept buying on tick for years, dangling the prospect of an inherited estate or a forthcoming marriage settlement before his unfortunate tailor or wine merchant.”
You can find the rest of the article here.