Paperform

Promptfree, for everyone, and the only version there is

Open the prompt in Claude CodeOpen the prompt in CodexOpen the prompt in Cursor

Copy

Build me a form that reads like a page, takes a payment, and totals a price as it goes.

STACK
- Astro with a Node adapter, SQLite via better-sqlite3
- Stripe Checkout for money; never touch a card number

THE DOCUMENT MODEL
- A form is Markdown with inline field tokens, so the surrounding copy is part of the form
- Each token declares a type and a name; everything else is prose
- Render server-side to a single page that works with JavaScript disabled

CALCULATIONS
- A price expression referencing field names, evaluated on the client for feedback and again on the server before charging
- The server total is the only one that reaches Stripe — never trust the number the browser posts
- Show the working: line items, then the total, so the respondent can check it

PAYMENT
- Create a Checkout Session with the server-computed amount and the submission id in metadata
- Mark the submission paid only from the webhook, never from the success redirect
- Store every Stripe event append-only for reconciliation

VALIDATION
- Required, min, max, pattern, and a cross-field rule expressed in the same expression language as the price

AFTER SUBMISSION
- A receipt to the respondent and a notification to the owner
- CSV export including the computed total and the payment state

Include a README covering the Stripe webhook secret, testing with the CLI, and what happens to a submission whose payment never completes.