feat(payment): expand Stripe methods and checkout handoff

src/lib/payment/payment_search_params.ts

@@ -22,6 +22,15 @@ export function parsePaymentPayChannel(
   return channel === "ezpay" || channel === "stripe" ? channel : null;
 }
 
+export function parsePaymentAutoRenew(
+  value: PaymentSearchParamValue,
+): boolean | null {
+  const autoRenew = getFirstPaymentSearchParam(value);
+  if (autoRenew === "1" || autoRenew === "true") return true;
+  if (autoRenew === "0" || autoRenew === "false") return false;
+  return null;
+}
+
 export function parseSubscriptionReturnTo(
   value: PaymentSearchParamValue,
 ): AppSubscriptionReturnTo {