diff --git a/packages/ndk/lib/domain_layer/usecases/zaps/Invoice_response.dart b/packages/ndk/lib/domain_layer/usecases/zaps/Invoice_response.dart
index 44ae1130..35fd4d43 100644
--- a/packages/ndk/lib/domain_layer/usecases/zaps/Invoice_response.dart
+++ b/packages/ndk/lib/domain_layer/usecases/zaps/Invoice_response.dart
@@ -5,5 +5,6 @@ class InvoiceResponse {
   String? nostrPubkey;
 
   /// .
-  InvoiceResponse({required this.invoice, this.nostrPubkey, required this.amountSats});
+  InvoiceResponse(
+      {required this.invoice, this.nostrPubkey, required this.amountSats});
 }
diff --git a/packages/ndk/lib/domain_layer/usecases/zaps/zap_receipt.dart b/packages/ndk/lib/domain_layer/usecases/zaps/zap_receipt.dart
index a1ba1d3f..5ef239e3 100644
--- a/packages/ndk/lib/domain_layer/usecases/zaps/zap_receipt.dart
+++ b/packages/ndk/lib/domain_layer/usecases/zaps/zap_receipt.dart
@@ -1,23 +1,44 @@
 import 'dart:convert';
 
-import 'package:ndk/domain_layer/entities/nip_01_event.dart';
-import 'package:ndk/domain_layer/usecases/lnurl/lnurl.dart';
-
 import '../../../shared/logger/logger.dart';
+import '../../entities/nip_01_event.dart';
+import '../lnurl/lnurl.dart';
 
 class ZapReceipt {
+  /// zap receipt kind
   static const KIND = 9735;
 
+  /// time payment happend
   int? paidAt;
+
+  /// amount in sats
   int? amountSats;
+
+  /// pubKey
   String? pubKey;
+
+  /// invoice
   String? bolt11;
+
+  /// invoice preimage
   String? preimage;
+
+  /// pubkey of recipient
   String? recipient;
+
+  /// nostr eventId
   String? eventId;
+
+  /// user defined comment
   String? comment;
+
+  /// pubkey sender
   String? sender;
+
+  ///
   String? anon;
+
+  /// lnurl
   String? lnurl;
 
   ZapReceipt.fromEvent(Nip01Event event) {
@@ -70,13 +91,13 @@ class ZapReceipt {
       return false;
     }
     //  - The invoiceAmount contained in the bolt11 tag of the zap receipt MUST equal the amount tag of the zap request (if present).
-    if (bolt11!=null && bolt11!.isNotEmpty) {
+    if (bolt11 != null && bolt11!.isNotEmpty) {
       if (amountSats != Lnurl.getAmountFromBolt11(bolt11!)) {
         return false;
       }
     }
     //  - The lnurl tag of the zap request (if present) SHOULD equal the recipient's lnurl.
-    if (lnurl!=null && lnurl!.isNotEmpty) {
+    if (lnurl != null && lnurl!.isNotEmpty) {
       if (lnurl != recipientLnurl) {
         return false;
       }
diff --git a/packages/ndk/lib/domain_layer/usecases/zaps/zap_request.dart b/packages/ndk/lib/domain_layer/usecases/zaps/zap_request.dart
index 27d81599..ad0d9296 100644
--- a/packages/ndk/lib/domain_layer/usecases/zaps/zap_request.dart
+++ b/packages/ndk/lib/domain_layer/usecases/zaps/zap_request.dart
@@ -1,4 +1,4 @@
-import 'package:ndk/domain_layer/entities/nip_01_event.dart';
+import '../../entities/nip_01_event.dart';
 
 /// Zap Request
 class ZapRequest extends Nip01Event {
diff --git a/packages/ndk/lib/domain_layer/usecases/zaps/zaps.dart b/packages/ndk/lib/domain_layer/usecases/zaps/zaps.dart
index 679071ef..2ca99f49 100644
--- a/packages/ndk/lib/domain_layer/usecases/zaps/zaps.dart
+++ b/packages/ndk/lib/domain_layer/usecases/zaps/zaps.dart
@@ -12,7 +12,7 @@ import '../nwc/nwc.dart';
 import '../nwc/nwc_connection.dart';
 import '../nwc/responses/pay_invoice_response.dart';
 import '../requests/requests.dart';
-import 'Invoice_response.dart';
+import 'invoice_response.dart';
 import 'zap_receipt.dart';
 import 'zap_request.dart';