fix(shopinbit): drop the by-customer car ticket fallback

diff --git a/lib/db/drift/shared_db/shared_database.dart b/lib/db/drift/shared_db/shared_database.dart
index ec39151..70a9aca 100644
--- a/lib/db/drift/shared_db/shared_database.dart
+++ b/lib/db/drift/shared_db/shared_database.dart
@@ -80,13 +80,6 @@ class ShopInBitTicketsDao extends DatabaseAccessor<SharedDatabase>
     )..where((t) => t.apiTicketId.equals(apiTicketId))).watchSingleOrNull();
   }
 
-  Future<List<ShopInBitTicket>> getByCustomerKey(String customerKey) {
-    return (select(shopInBitTickets)
-          ..where((t) => t.customerKey.equals(customerKey))
-          ..orderBy([(t) => OrderingTerm.desc(t.createdAt)]))
-        .get();
-  }
-
   /// All tickets for the active customer key, newest first.
   Stream<List<ShopInBitTicket>> watchByCustomerKey(String customerKey) {
     return (select(shopInBitTickets)
diff --git a/lib/pages/shopinbit/shopinbit_car_research_payment_view.dart b/lib/pages/shopinbit/shopinbit_car_research_payment_view.dart
index 2896158..e882976 100644
--- a/lib/pages/shopinbit/shopinbit_car_research_payment_view.dart
+++ b/lib/pages/shopinbit/shopinbit_car_research_payment_view.dart
@@ -56,10 +56,8 @@ class _ShopInBitCarResearchPaymentViewState
   String _statusString = "ready_to_pay";
   String? _additional;
   bool _finalized = false;
-  // From the finalized status: the real ticket is the customer chat, the
-  // receipt is just the paid-fee receipt.
+  // The real car ticket id (the customer chat) from the finalized status.
   int? _realTicketId;
-  int? _receiptTicketId;
   List<String> _methods = [];
   List<String> _addresses = [];
   int _selectedMethod = 0;
@@ -349,7 +347,6 @@ class _ShopInBitCarResearchPaymentViewState
         _additional = _status!.additional;
         _finalized = _status!.finalized;
         _realTicketId = _status!.realTicketId;
-        _receiptTicketId = _status!.receiptTicketId;
       });
       if (_isTerminal) {
         _pollTimer?.cancel();
@@ -385,35 +382,10 @@ class _ShopInBitCarResearchPaymentViewState
     setState(() => _flowState = _PaymentFlowState.finalizing);
     _pollTimer?.cancel();
 
-    final service = ref.read(pShopinBitService);
-
     try {
-      // The finalized status usually gives us the real car ticket id (the
-      // customer chat), so open that. It can be null for a bit (sandbox, or
-      // while the ticket is still being created), so fall back to by-customer,
-      // using the receipt id to skip the receipt ticket. The BTCPay webhook
-      // creates the ticket either way.
-      int? realId = _realTicketId;
-      const int maxAttempts = 8;
-      for (
-        int attempt = 0;
-        attempt < maxAttempts && realId == null;
-        attempt++
-      ) {
-        // Re-poll the status first in case the real ticket id has appeared.
-        final statusResp = await service.client.getCarResearchInvoiceStatus(
-          widget.invoice.btcpayInvoice,
-        );
-        realId = statusResp.value?.realTicketId;
-        // Fall back to the by-customer heuristic, excluding the receipt id.
-        realId ??= await service.adoptRealCarTicket(
-          statusResp.value?.receiptTicketId ?? _receiptTicketId ?? 0,
-        );
-        if (realId == null && attempt < maxAttempts - 1) {
-          final int seconds = (1 << (attempt + 1)).clamp(2, 15).toInt();
-          await Future<void>.delayed(Duration(seconds: seconds));
-        }
-      }
+      // The finalized status carries the real car ticket id (the customer
+      // chat), so open that. The BTCPay webhook creates the ticket regardless.
+      final int? realId = _realTicketId;
 
       if (!mounted) return;
       setState(() => _flowState = _PaymentFlowState.complete);
diff --git a/lib/services/shopinbit/shopinbit_service.dart b/lib/services/shopinbit/shopinbit_service.dart
index 0061eca..107da76 100644
--- a/lib/services/shopinbit/shopinbit_service.dart
+++ b/lib/services/shopinbit/shopinbit_service.dart
@@ -181,47 +181,6 @@ class ShopInBitService {
     return ref;
   }
 
-  /// Fallback for finding the real car research ticket when the status endpoint
-  /// hasn't populated real_ticket_id yet (sandbox, or briefly while the ticket
-  /// is being created).
-  ///
-  /// The fee receipt id can't be polled by the customer key (403s); the real
-  /// ticket is a separate id that shows up in by-customer. Grab the newest
-  /// ticket we don't already track (not the receipt), hydrate it, and return
-  /// its id, or null if it's not there yet.
-  Future<int?> adoptRealCarTicket(int receiptTicketId) async {
-    final String key = await ensureCustomerKey();
-    final ApiResponse<List<TicketRef>> resp = await _ticketsByCustomer(key);
-    if (resp.hasError || resp.value == null) return null;
-
-    final Set<int> known = (await db.shopInBitTicketsDao.getByCustomerKey(
-      key,
-    )).map((t) => t.apiTicketId).toSet();
-
-    final List<TicketRef> candidates =
-        resp.value!
-            .where((t) => t.id != receiptTicketId && !known.contains(t.id))
-            .toList()
-          ..sort((a, b) => b.id.compareTo(a.id));
-
-    // Newest first; the receipt 403s (no row written) so it gets skipped.
-    for (final TicketRef ref in candidates) {
-      try {
-        await _refreshRef(ref, key);
-      } catch (e, s) {
-        Logging.instance.w(
-          "Failed to refresh candidate ticket ${ref.id}, trying next",
-          error: e,
-          stackTrace: s,
-        );
-      }
-      if (await db.shopInBitTicketsDao.getByApiId(ref.id) != null) {
-        return ref.id;
-      }
-    }
-    return null;
-  }
-
   Future<bool> sendMessage(int apiTicketId, String message) async {
     final ApiResponse<Map<String, dynamic>> resp = await client.sendMessage(
       apiTicketId,