API

Validation

• validateWithdrawal(input), validateCancellation(input), validate(kind, input): return { ok: true, value } or { ok: false, errors: [{ field, code }] }. Codes: required, email, too_long, date, type.

Records and receipts

• createRecord(kind, data, { locale?, now?, id?, endsAt? })
• createReference(kind): random reference such as W-7K3QX9PD
• renderReceipt(record, { company, timeZone?, messages? }): { to, subject, text, html }
• declarationText(record, { company?, timeZone?, messages? }): plain-text copy for the download
• declarationFields(kind, data, locale?, messages?): label/value pairs for your own review step
• formatDateTime(iso, locale, timeZone?), formatDate(isoDate, locale)

Deadlines

• withdrawalDeadline({ start, informed?, isHoliday? }): last day of the withdrawal period
• isWithinWithdrawalPeriod({ start, at?, timeZone?, informed?, isHoliday? })
• contractEndDate({ received, notice, termEnd?, requested? })
• addPeriod(date, { days?, weeks?, months? }), nextWorkingDay(date, isHoliday?), toIsoDate(date, timeZone?)

Handler

• createInverseHandler(options): (request: Request) => Promise<Response>
• handleDeclaration(body, options): same logic for frameworks without Fetch API
• HONEYPOT_FIELD

Texts

• getMessages(locale, overrides?), messages, locales, isLocale(value), format(template, values)

Page check

• checkUrl(url, kinds?, init?), checkHtml(html, kinds?), extractControls(html), checkControls(controls, kinds)