diff --git a/packages/ndk/test/data_layer/cache_manager/mem_cache_manager_test.mocks.dart b/packages/ndk/test/data_layer/cache_manager/mem_cache_manager_test.mocks.dart
index e5873c43d..573c9b8f4 100644
--- a/packages/ndk/test/data_layer/cache_manager/mem_cache_manager_test.mocks.dart
+++ b/packages/ndk/test/data_layer/cache_manager/mem_cache_manager_test.mocks.dart
@@ -867,6 +867,12 @@ class MockNip01Event extends _i1.Mock implements _i3.Nip01Event {
         ),
         returnValueForMissingStub: null,
       );
+
+  @override
+  String? getFirstTag(String? name) => (super.noSuchMethod(Invocation.method(
+        #getFirstTag,
+        [name],
+      )) as String?);
 }
 
 /// A class which mocks [Nip05].
diff --git a/packages/ndk/test/usecases/lnurl/lnurl_test.mocks.dart b/packages/ndk/test/usecases/lnurl/lnurl_test.mocks.dart
index 9076e3577..2921e0557 100644
--- a/packages/ndk/test/usecases/lnurl/lnurl_test.mocks.dart
+++ b/packages/ndk/test/usecases/lnurl/lnurl_test.mocks.dart
@@ -1,4 +1,4 @@
-// Mocks generated by Mockito 5.4.5 from annotations
+// Mocks generated by Mockito 5.4.4 from annotations
 // in ndk/test/usecases/lnurl/lnurl_test.dart.
 // Do not manually edit this file.
 
@@ -19,21 +19,30 @@ import 'package:mockito/src/dummies.dart' as _i5;
 // ignore_for_file: deprecated_member_use_from_same_package
 // ignore_for_file: implementation_imports
 // ignore_for_file: invalid_use_of_visible_for_testing_member
-// ignore_for_file: must_be_immutable
 // ignore_for_file: prefer_const_constructors
 // ignore_for_file: unnecessary_parenthesis
 // ignore_for_file: camel_case_types
 // ignore_for_file: subtype_of_sealed_class
 
 class _FakeResponse_0 extends _i1.SmartFake implements _i2.Response {
-  _FakeResponse_0(Object parent, Invocation parentInvocation)
-    : super(parent, parentInvocation);
+  _FakeResponse_0(
+    Object parent,
+    Invocation parentInvocation,
+  ) : super(
+          parent,
+          parentInvocation,
+        );
 }
 
 class _FakeStreamedResponse_1 extends _i1.SmartFake
     implements _i2.StreamedResponse {
-  _FakeStreamedResponse_1(Object parent, Invocation parentInvocation)
-    : super(parent, parentInvocation);
+  _FakeStreamedResponse_1(
+    Object parent,
+    Invocation parentInvocation,
+  ) : super(
+          parent,
+          parentInvocation,
+        );
 }
 
 /// A class which mocks [Client].
@@ -45,30 +54,46 @@ class MockClient extends _i1.Mock implements _i2.Client {
   }
 
   @override
-  _i3.Future<_i2.Response> head(Uri? url, {Map<String, String>? headers}) =>
+  _i3.Future<_i2.Response> head(
+    Uri? url, {
+    Map<String, String>? headers,
+  }) =>
       (super.noSuchMethod(
-            Invocation.method(#head, [url], {#headers: headers}),
-            returnValue: _i3.Future<_i2.Response>.value(
-              _FakeResponse_0(
-                this,
-                Invocation.method(#head, [url], {#headers: headers}),
-              ),
-            ),
-          )
-          as _i3.Future<_i2.Response>);
+        Invocation.method(
+          #head,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #head,
+            [url],
+            {#headers: headers},
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
 
   @override
-  _i3.Future<_i2.Response> get(Uri? url, {Map<String, String>? headers}) =>
+  _i3.Future<_i2.Response> get(
+    Uri? url, {
+    Map<String, String>? headers,
+  }) =>
       (super.noSuchMethod(
-            Invocation.method(#get, [url], {#headers: headers}),
-            returnValue: _i3.Future<_i2.Response>.value(
-              _FakeResponse_0(
-                this,
-                Invocation.method(#get, [url], {#headers: headers}),
-              ),
-            ),
-          )
-          as _i3.Future<_i2.Response>);
+        Invocation.method(
+          #get,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #get,
+            [url],
+            {#headers: headers},
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
 
   @override
   _i3.Future<_i2.Response> post(
@@ -78,23 +103,28 @@ class MockClient extends _i1.Mock implements _i2.Client {
     _i4.Encoding? encoding,
   }) =>
       (super.noSuchMethod(
-            Invocation.method(
-              #post,
-              [url],
-              {#headers: headers, #body: body, #encoding: encoding},
-            ),
-            returnValue: _i3.Future<_i2.Response>.value(
-              _FakeResponse_0(
-                this,
-                Invocation.method(
-                  #post,
-                  [url],
-                  {#headers: headers, #body: body, #encoding: encoding},
-                ),
-              ),
-            ),
-          )
-          as _i3.Future<_i2.Response>);
+        Invocation.method(
+          #post,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #post,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
 
   @override
   _i3.Future<_i2.Response> put(
@@ -104,23 +134,28 @@ class MockClient extends _i1.Mock implements _i2.Client {
     _i4.Encoding? encoding,
   }) =>
       (super.noSuchMethod(
-            Invocation.method(
-              #put,
-              [url],
-              {#headers: headers, #body: body, #encoding: encoding},
-            ),
-            returnValue: _i3.Future<_i2.Response>.value(
-              _FakeResponse_0(
-                this,
-                Invocation.method(
-                  #put,
-                  [url],
-                  {#headers: headers, #body: body, #encoding: encoding},
-                ),
-              ),
-            ),
-          )
-          as _i3.Future<_i2.Response>);
+        Invocation.method(
+          #put,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #put,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
 
   @override
   _i3.Future<_i2.Response> patch(
@@ -130,23 +165,28 @@ class MockClient extends _i1.Mock implements _i2.Client {
     _i4.Encoding? encoding,
   }) =>
       (super.noSuchMethod(
-            Invocation.method(
-              #patch,
-              [url],
-              {#headers: headers, #body: body, #encoding: encoding},
-            ),
-            returnValue: _i3.Future<_i2.Response>.value(
-              _FakeResponse_0(
-                this,
-                Invocation.method(
-                  #patch,
-                  [url],
-                  {#headers: headers, #body: body, #encoding: encoding},
-                ),
-              ),
-            ),
-          )
-          as _i3.Future<_i2.Response>);
+        Invocation.method(
+          #patch,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #patch,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
 
   @override
   _i3.Future<_i2.Response> delete(
@@ -156,36 +196,49 @@ class MockClient extends _i1.Mock implements _i2.Client {
     _i4.Encoding? encoding,
   }) =>
       (super.noSuchMethod(
-            Invocation.method(
-              #delete,
-              [url],
-              {#headers: headers, #body: body, #encoding: encoding},
-            ),
-            returnValue: _i3.Future<_i2.Response>.value(
-              _FakeResponse_0(
-                this,
-                Invocation.method(
-                  #delete,
-                  [url],
-                  {#headers: headers, #body: body, #encoding: encoding},
-                ),
-              ),
-            ),
-          )
-          as _i3.Future<_i2.Response>);
+        Invocation.method(
+          #delete,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #delete,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
 
   @override
-  _i3.Future<String> read(Uri? url, {Map<String, String>? headers}) =>
+  _i3.Future<String> read(
+    Uri? url, {
+    Map<String, String>? headers,
+  }) =>
       (super.noSuchMethod(
-            Invocation.method(#read, [url], {#headers: headers}),
-            returnValue: _i3.Future<String>.value(
-              _i5.dummyValue<String>(
-                this,
-                Invocation.method(#read, [url], {#headers: headers}),
-              ),
-            ),
-          )
-          as _i3.Future<String>);
+        Invocation.method(
+          #read,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<String>.value(_i5.dummyValue<String>(
+          this,
+          Invocation.method(
+            #read,
+            [url],
+            {#headers: headers},
+          ),
+        )),
+      ) as _i3.Future<String>);
 
   @override
   _i3.Future<_i6.Uint8List> readBytes(
@@ -193,27 +246,37 @@ class MockClient extends _i1.Mock implements _i2.Client {
     Map<String, String>? headers,
   }) =>
       (super.noSuchMethod(
-            Invocation.method(#readBytes, [url], {#headers: headers}),
-            returnValue: _i3.Future<_i6.Uint8List>.value(_i6.Uint8List(0)),
-          )
-          as _i3.Future<_i6.Uint8List>);
+        Invocation.method(
+          #readBytes,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<_i6.Uint8List>.value(_i6.Uint8List(0)),
+      ) as _i3.Future<_i6.Uint8List>);
 
   @override
   _i3.Future<_i2.StreamedResponse> send(_i2.BaseRequest? request) =>
       (super.noSuchMethod(
-            Invocation.method(#send, [request]),
-            returnValue: _i3.Future<_i2.StreamedResponse>.value(
-              _FakeStreamedResponse_1(
-                this,
-                Invocation.method(#send, [request]),
-              ),
-            ),
-          )
-          as _i3.Future<_i2.StreamedResponse>);
+        Invocation.method(
+          #send,
+          [request],
+        ),
+        returnValue:
+            _i3.Future<_i2.StreamedResponse>.value(_FakeStreamedResponse_1(
+          this,
+          Invocation.method(
+            #send,
+            [request],
+          ),
+        )),
+      ) as _i3.Future<_i2.StreamedResponse>);
 
   @override
   void close() => super.noSuchMethod(
-    Invocation.method(#close, []),
-    returnValueForMissingStub: null,
-  );
+        Invocation.method(
+          #close,
+          [],
+        ),
+        returnValueForMissingStub: null,
+      );
 }
diff --git a/packages/ndk/test/usecases/zaps/zap_receipt_test.dart b/packages/ndk/test/usecases/zaps/zap_receipt_test.dart
new file mode 100644
index 000000000..b300aa3c5
--- /dev/null
+++ b/packages/ndk/test/usecases/zaps/zap_receipt_test.dart
@@ -0,0 +1,195 @@
+import 'dart:convert';
+
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'package:ndk/domain_layer/usecases/lnurl/lnurl.dart';
+import 'package:ndk/ndk.dart';
+import 'package:test/test.dart';
+
+import 'zap_receipt_test.mocks.dart';
+
+// Mock classes
+@GenerateMocks([Nip01Event])
+void main() {
+  group('ZapReceipt', () {
+    late MockNip01Event mockEvent;
+
+    setUp(() {
+      mockEvent = MockNip01Event();
+    });
+
+    test('fromEvent initializes correctly with valid event', () {
+      when(mockEvent.kind).thenReturn(9735);
+      when(mockEvent.pubKey).thenReturn('testPubKey');
+      when(mockEvent.tags).thenReturn([
+        ['bolt11', 'testBolt11'],
+        ['preimage', 'testPreimage'],
+        [
+          'description',
+          jsonEncode({
+            'id':'duparomana',
+            'pubkey': 'testSender',
+            'kind': ZapRequest.KIND,
+            'sig': "sig",
+            'created_at':DateTime.now().millisecondsSinceEpoch,
+            'content': 'testComment',
+            'pubKey': 'testSender',
+            'tags': [
+              ['lnurl', 'testLnurl'],
+              ['amount', '1000']
+            ]
+          })
+        ],
+        ['p', 'testRecipient'],
+        ['e', 'testEventId'],
+        ['anon', 'testAnon'],
+        ['P', 'testSender']
+      ]);
+      when(mockEvent.createdAt).thenReturn(1234567890);
+
+      final zapReceipt = ZapReceipt.fromEvent(mockEvent);
+
+      expect(zapReceipt.pubKey, 'testPubKey');
+      expect(zapReceipt.bolt11, 'testBolt11');
+      expect(zapReceipt.preimage, 'testPreimage');
+      expect(zapReceipt.comment, 'testComment');
+      expect(zapReceipt.sender, 'testSender');
+      expect(zapReceipt.lnurl, 'testLnurl');
+      expect(zapReceipt.amountSats, 1); // 1000 msats = 1 sat
+      expect(zapReceipt.recipient, 'testRecipient');
+      expect(zapReceipt.eventId, 'testEventId');
+      expect(zapReceipt.anon, 'testAnon');
+      expect(zapReceipt.paidAt, 1234567890);
+    });
+
+    test('fromEvent throws exception for non-nip57 event', () {
+      when(mockEvent.pubKey).thenReturn('testPubKey');
+      when(mockEvent.createdAt).thenReturn(1234567890);
+      when(mockEvent.kind).thenReturn(1234);
+
+      expect(() => ZapReceipt.fromEvent(mockEvent), throwsException);
+    });
+
+    test('isValid returns true for valid zap receipt', () {
+      when(mockEvent.kind).thenReturn(9735);
+      when(mockEvent.pubKey).thenReturn('testPubKey');
+      when(mockEvent.createdAt).thenReturn(1234567890);
+      when(mockEvent.tags).thenReturn([
+        ['bolt11', 'lnbc15u1p'],
+        [
+          'description',
+          jsonEncode({
+            'id':'duparomana',
+            'pubkey': 'testSender',
+            'kind': ZapRequest.KIND,
+            'sig': "sig",
+            'created_at':DateTime.now().millisecondsSinceEpoch,
+            'content':'',
+            'tags': [
+              ['lnurl', 'testLnurl'],
+              ['amount', '1500000']
+            ]
+          })
+        ]
+      ]);
+
+      final zapReceipt = ZapReceipt.fromEvent(mockEvent);
+
+      expect(
+          zapReceipt.isValid(
+              nostrPubKey: 'testPubKey', recipientLnurl: 'testLnurl'),
+          isTrue);
+    });
+
+    test('isValid returns false for invalid pubKey', () {
+      when(mockEvent.kind).thenReturn(9735);
+      when(mockEvent.pubKey).thenReturn('wrongPubKey');
+      when(mockEvent.createdAt).thenReturn(1234567890);
+      when(mockEvent.tags).thenReturn([
+        ['bolt11', 'lnbc15u1p'],
+        [
+          'description',
+          jsonEncode({
+            'id':'duparomana',
+            'pubkey': 'testSender',
+            'kind': ZapRequest.KIND,
+            'sig': "sig",
+            'created_at':DateTime.now().millisecondsSinceEpoch,
+            'content':'',
+            'tags': [
+              ['lnurl', 'testLnurl'],
+              ['amount', '1500000']
+            ]
+          })
+        ]
+      ]);
+
+      final zapReceipt = ZapReceipt.fromEvent(mockEvent);
+      expect(
+          zapReceipt.isValid(
+              nostrPubKey: 'testPubKey', recipientLnurl: 'testLnurl'),
+          isFalse);
+    });
+
+    test('isValid returns false for mismatched amount', () {
+      when(mockEvent.kind).thenReturn(9735);
+      when(mockEvent.pubKey).thenReturn('testPubKey');
+      when(mockEvent.createdAt).thenReturn(1234567890);
+      when(mockEvent.tags).thenReturn([
+        ['bolt11', 'lnbc15u1p'],
+        [
+          'description',
+          jsonEncode({
+            'id':'duparomana',
+            'pubkey': 'testSender',
+            'kind': ZapRequest.KIND,
+            'sig': "sig",
+            'created_at':DateTime.now().millisecondsSinceEpoch,
+            'content':'',
+            'tags': [
+              ['lnurl', 'testLnurl'],
+              ['amount', '2000000']
+            ]
+          })
+        ]
+      ]);
+
+      final zapReceipt = ZapReceipt.fromEvent(mockEvent);
+      expect(
+          zapReceipt.isValid(
+              nostrPubKey: 'testPubKey', recipientLnurl: 'testLnurl'),
+          isFalse);
+    });
+
+    test('isValid returns false for mismatched lnurl', () {
+      when(mockEvent.kind).thenReturn(9735);
+      when(mockEvent.pubKey).thenReturn('testPubKey');
+      when(mockEvent.createdAt).thenReturn(1234567890);
+      when(mockEvent.tags).thenReturn([
+        ['bolt11', 'lnbc15u1p'],
+        [
+          'description',
+          jsonEncode({
+            'id':'duparomana',
+            'pubkey': 'testSender',
+            'kind': ZapRequest.KIND,
+            'sig': "sig",
+            'created_at':DateTime.now().millisecondsSinceEpoch,
+            'content':'',
+            'tags': [
+              ['lnurl', 'wrongLnurl'],
+              ['amount', '1500000']
+            ]
+          })
+        ]
+      ]);
+
+      final zapReceipt = ZapReceipt.fromEvent(mockEvent);
+
+      expect(
+          zapReceipt.isValid(
+              nostrPubKey: 'testPubKey', recipientLnurl: 'testLnurl'),
+          isFalse);
+    });
+  });
+}
diff --git a/packages/ndk/test/usecases/zaps/zap_receipt_test.mocks.dart b/packages/ndk/test/usecases/zaps/zap_receipt_test.mocks.dart
new file mode 100644
index 000000000..4ea34cff5
--- /dev/null
+++ b/packages/ndk/test/usecases/zaps/zap_receipt_test.mocks.dart
@@ -0,0 +1,201 @@
+// Mocks generated by Mockito 5.4.4 from annotations
+// in ndk/test/usecases/zaps/zap_receipt_test.dart.
+// Do not manually edit this file.
+
+// ignore_for_file: no_leading_underscores_for_library_prefixes
+import 'package:mockito/mockito.dart' as _i1;
+import 'package:mockito/src/dummies.dart' as _i3;
+import 'package:ndk/domain_layer/entities/nip_01_event.dart' as _i2;
+
+// ignore_for_file: type=lint
+// ignore_for_file: avoid_redundant_argument_values
+// ignore_for_file: avoid_setters_without_getters
+// ignore_for_file: comment_references
+// ignore_for_file: deprecated_member_use
+// ignore_for_file: deprecated_member_use_from_same_package
+// ignore_for_file: implementation_imports
+// ignore_for_file: invalid_use_of_visible_for_testing_member
+// ignore_for_file: prefer_const_constructors
+// ignore_for_file: unnecessary_parenthesis
+// ignore_for_file: camel_case_types
+// ignore_for_file: subtype_of_sealed_class
+
+/// A class which mocks [Nip01Event].
+///
+/// See the documentation for Mockito's code generation for more information.
+class MockNip01Event extends _i1.Mock implements _i2.Nip01Event {
+  MockNip01Event() {
+    _i1.throwOnMissingStub(this);
+  }
+
+  @override
+  String get id => (super.noSuchMethod(
+        Invocation.getter(#id),
+        returnValue: _i3.dummyValue<String>(
+          this,
+          Invocation.getter(#id),
+        ),
+      ) as String);
+
+  @override
+  set id(String? _id) => super.noSuchMethod(
+        Invocation.setter(
+          #id,
+          _id,
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  String get pubKey => (super.noSuchMethod(
+        Invocation.getter(#pubKey),
+        returnValue: _i3.dummyValue<String>(
+          this,
+          Invocation.getter(#pubKey),
+        ),
+      ) as String);
+
+  @override
+  int get createdAt => (super.noSuchMethod(
+        Invocation.getter(#createdAt),
+        returnValue: 0,
+      ) as int);
+
+  @override
+  set createdAt(int? _createdAt) => super.noSuchMethod(
+        Invocation.setter(
+          #createdAt,
+          _createdAt,
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  int get kind => (super.noSuchMethod(
+        Invocation.getter(#kind),
+        returnValue: 0,
+      ) as int);
+
+  @override
+  List<List<String>> get tags => (super.noSuchMethod(
+        Invocation.getter(#tags),
+        returnValue: <List<String>>[],
+      ) as List<List<String>>);
+
+  @override
+  set tags(List<List<String>>? _tags) => super.noSuchMethod(
+        Invocation.setter(
+          #tags,
+          _tags,
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  String get content => (super.noSuchMethod(
+        Invocation.getter(#content),
+        returnValue: _i3.dummyValue<String>(
+          this,
+          Invocation.getter(#content),
+        ),
+      ) as String);
+
+  @override
+  set content(String? _content) => super.noSuchMethod(
+        Invocation.setter(
+          #content,
+          _content,
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  String get sig => (super.noSuchMethod(
+        Invocation.getter(#sig),
+        returnValue: _i3.dummyValue<String>(
+          this,
+          Invocation.getter(#sig),
+        ),
+      ) as String);
+
+  @override
+  set sig(String? _sig) => super.noSuchMethod(
+        Invocation.setter(
+          #sig,
+          _sig,
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  set validSig(bool? _validSig) => super.noSuchMethod(
+        Invocation.setter(
+          #validSig,
+          _validSig,
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  List<String> get sources => (super.noSuchMethod(
+        Invocation.getter(#sources),
+        returnValue: <String>[],
+      ) as List<String>);
+
+  @override
+  set sources(List<String>? _sources) => super.noSuchMethod(
+        Invocation.setter(
+          #sources,
+          _sources,
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  bool get isIdValid => (super.noSuchMethod(
+        Invocation.getter(#isIdValid),
+        returnValue: false,
+      ) as bool);
+
+  @override
+  List<String> get tTags => (super.noSuchMethod(
+        Invocation.getter(#tTags),
+        returnValue: <String>[],
+      ) as List<String>);
+
+  @override
+  List<String> get pTags => (super.noSuchMethod(
+        Invocation.getter(#pTags),
+        returnValue: <String>[],
+      ) as List<String>);
+
+  @override
+  List<String> get replyETags => (super.noSuchMethod(
+        Invocation.getter(#replyETags),
+        returnValue: <String>[],
+      ) as List<String>);
+
+  @override
+  Map<String, dynamic> toJson() => (super.noSuchMethod(
+        Invocation.method(
+          #toJson,
+          [],
+        ),
+        returnValue: <String, dynamic>{},
+      ) as Map<String, dynamic>);
+
+  @override
+  void sign(String? privateKey) => super.noSuchMethod(
+        Invocation.method(
+          #sign,
+          [privateKey],
+        ),
+        returnValueForMissingStub: null,
+      );
+
+  @override
+  String? getFirstTag(String? name) => (super.noSuchMethod(Invocation.method(
+        #getFirstTag,
+        [name],
+      )) as String?);
+}
diff --git a/packages/ndk/test/usecases/zaps/zaps_test.mocks.dart b/packages/ndk/test/usecases/zaps/zaps_test.mocks.dart
new file mode 100644
index 000000000..3cfe3c00a
--- /dev/null
+++ b/packages/ndk/test/usecases/zaps/zaps_test.mocks.dart
@@ -0,0 +1,282 @@
+// Mocks generated by Mockito 5.4.4 from annotations
+// in ndk/test/usecases/zaps/zaps_test.dart.
+// Do not manually edit this file.
+
+// ignore_for_file: no_leading_underscores_for_library_prefixes
+import 'dart:async' as _i3;
+import 'dart:convert' as _i4;
+import 'dart:typed_data' as _i6;
+
+import 'package:http/http.dart' as _i2;
+import 'package:mockito/mockito.dart' as _i1;
+import 'package:mockito/src/dummies.dart' as _i5;
+
+// ignore_for_file: type=lint
+// ignore_for_file: avoid_redundant_argument_values
+// ignore_for_file: avoid_setters_without_getters
+// ignore_for_file: comment_references
+// ignore_for_file: deprecated_member_use
+// ignore_for_file: deprecated_member_use_from_same_package
+// ignore_for_file: implementation_imports
+// ignore_for_file: invalid_use_of_visible_for_testing_member
+// ignore_for_file: prefer_const_constructors
+// ignore_for_file: unnecessary_parenthesis
+// ignore_for_file: camel_case_types
+// ignore_for_file: subtype_of_sealed_class
+
+class _FakeResponse_0 extends _i1.SmartFake implements _i2.Response {
+  _FakeResponse_0(
+    Object parent,
+    Invocation parentInvocation,
+  ) : super(
+          parent,
+          parentInvocation,
+        );
+}
+
+class _FakeStreamedResponse_1 extends _i1.SmartFake
+    implements _i2.StreamedResponse {
+  _FakeStreamedResponse_1(
+    Object parent,
+    Invocation parentInvocation,
+  ) : super(
+          parent,
+          parentInvocation,
+        );
+}
+
+/// A class which mocks [Client].
+///
+/// See the documentation for Mockito's code generation for more information.
+class MockClient extends _i1.Mock implements _i2.Client {
+  MockClient() {
+    _i1.throwOnMissingStub(this);
+  }
+
+  @override
+  _i3.Future<_i2.Response> head(
+    Uri? url, {
+    Map<String, String>? headers,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #head,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #head,
+            [url],
+            {#headers: headers},
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
+
+  @override
+  _i3.Future<_i2.Response> get(
+    Uri? url, {
+    Map<String, String>? headers,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #get,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #get,
+            [url],
+            {#headers: headers},
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
+
+  @override
+  _i3.Future<_i2.Response> post(
+    Uri? url, {
+    Map<String, String>? headers,
+    Object? body,
+    _i4.Encoding? encoding,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #post,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #post,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
+
+  @override
+  _i3.Future<_i2.Response> put(
+    Uri? url, {
+    Map<String, String>? headers,
+    Object? body,
+    _i4.Encoding? encoding,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #put,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #put,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
+
+  @override
+  _i3.Future<_i2.Response> patch(
+    Uri? url, {
+    Map<String, String>? headers,
+    Object? body,
+    _i4.Encoding? encoding,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #patch,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #patch,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
+
+  @override
+  _i3.Future<_i2.Response> delete(
+    Uri? url, {
+    Map<String, String>? headers,
+    Object? body,
+    _i4.Encoding? encoding,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #delete,
+          [url],
+          {
+            #headers: headers,
+            #body: body,
+            #encoding: encoding,
+          },
+        ),
+        returnValue: _i3.Future<_i2.Response>.value(_FakeResponse_0(
+          this,
+          Invocation.method(
+            #delete,
+            [url],
+            {
+              #headers: headers,
+              #body: body,
+              #encoding: encoding,
+            },
+          ),
+        )),
+      ) as _i3.Future<_i2.Response>);
+
+  @override
+  _i3.Future<String> read(
+    Uri? url, {
+    Map<String, String>? headers,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #read,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<String>.value(_i5.dummyValue<String>(
+          this,
+          Invocation.method(
+            #read,
+            [url],
+            {#headers: headers},
+          ),
+        )),
+      ) as _i3.Future<String>);
+
+  @override
+  _i3.Future<_i6.Uint8List> readBytes(
+    Uri? url, {
+    Map<String, String>? headers,
+  }) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #readBytes,
+          [url],
+          {#headers: headers},
+        ),
+        returnValue: _i3.Future<_i6.Uint8List>.value(_i6.Uint8List(0)),
+      ) as _i3.Future<_i6.Uint8List>);
+
+  @override
+  _i3.Future<_i2.StreamedResponse> send(_i2.BaseRequest? request) =>
+      (super.noSuchMethod(
+        Invocation.method(
+          #send,
+          [request],
+        ),
+        returnValue:
+            _i3.Future<_i2.StreamedResponse>.value(_FakeStreamedResponse_1(
+          this,
+          Invocation.method(
+            #send,
+            [request],
+          ),
+        )),
+      ) as _i3.Future<_i2.StreamedResponse>);
+
+  @override
+  void close() => super.noSuchMethod(
+        Invocation.method(
+          #close,
+          [],
+        ),
+        returnValueForMissingStub: null,
+      );
+}