Abo: Mindestlaufzeit nur fuer Vertraege ab Bedingungen Version 3

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/services/stripeBilling.js

@@ -200,7 +200,7 @@ function addMonths(date, months) {
  * - Wunschtermin: fruehestens zum berechneten Zeitpunkt, sonst zum Ende des Abrechnungsmonats,
  *   in dem der Wunschtermin liegt
  */
-export function computeCancellationDate({ serviceStart, receivedAt = new Date(), requestedDate = null, kind = 'ordentlich' }) {
+export function computeCancellationDate({ serviceStart, receivedAt = new Date(), requestedDate = null, kind = 'ordentlich', minTermMonths = config.abo.minTermMonths }) {
   const start = new Date(serviceStart)
   const boundary = (k) => addMonths(start, k)
   const firstBoundaryFrom = (minK, notBefore) => {
@@ -208,7 +208,7 @@ export function computeCancellationDate({ serviceStart, receivedAt = new Date(),
     while (boundary(k) < notBefore) k += 1
     return k
   }
-  const minTermK = config.abo.minTermMonths
+  const minTermK = minTermMonths
   let k
   if (kind === 'geschaeftsaufgabe') {
     k = firstBoundaryFrom(1, addMonths(receivedAt, 1))
@@ -220,6 +220,11 @@ export function computeCancellationDate({ serviceStart, receivedAt = new Date(),
   return { effectiveAt: boundary(k), minTermEnd: boundary(minTermK), serviceStart: start }
 }
 
+/** Es gilt die Mindestlaufzeit der Bedingungen, denen der Kunde zugestimmt hat (erst ab Version 3). */
+export function minTermMonthsFor(termsVersion) {
+  return ['2026-09-25', '2026-09-25-v2'].includes(termsVersion) ? 0 : config.abo.minTermMonths
+}
+
 export function serviceStartOf(sub) {
   return new Date(((sub.trial_end || sub.start_date) || 0) * 1000)
 }
@@ -425,6 +430,7 @@ export async function cancelSubscriptionAt(subscriptionId, requestedDate = null,
     receivedAt,
     requestedDate,
     kind,
+    minTermMonths: minTermMonthsFor(sub.metadata?.termsVersion),
   })
   const periodEnd = periodEndOf(sub)
   const effectiveUnix = Math.floor(effectiveAt.getTime() / 1000)