Merge pull request #4 from AnexDev1/main

refactor: make currency optional

.flutter-plugins

@@ -1,2 +1,2 @@
 # This is a generated file; do not edit or check into version control.
-flutter_inappwebview=C:\\Users\\MRN\\AppData\\Local\\Pub\\Cache\\hosted\\pub.dev\\flutter_inappwebview-5.8.0\\
+flutter_inappwebview=/home/nexdev/.pub-cache/hosted/pub.dev/flutter_inappwebview-5.8.0/

.flutter-plugins-dependencies

@@ -1 +1 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_inappwebview","path":"C:\\\\Users\\\\MRN\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\flutter_inappwebview-5.8.0\\\\","native_build":true,"dependencies":[]}],"android":[{"name":"flutter_inappwebview","path":"C:\\\\Users\\\\MRN\\\\AppData\\\\Local\\\\Pub\\\\Cache\\\\hosted\\\\pub.dev\\\\flutter_inappwebview-5.8.0\\\\","native_build":true,"dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"flutter_inappwebview","dependencies":[]}],"date_created":"2024-02-24 12:36:42.394349","version":"3.16.8"}
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_inappwebview","path":"/home/nexdev/.pub-cache/hosted/pub.dev/flutter_inappwebview-5.8.0/","native_build":true,"dependencies":[]}],"android":[{"name":"flutter_inappwebview","path":"/home/nexdev/.pub-cache/hosted/pub.dev/flutter_inappwebview-5.8.0/","native_build":true,"dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"flutter_inappwebview","dependencies":[]}],"date_created":"2024-08-30 00:13:46.095605","version":"3.22.3"}

lib/src/chapa.dart

@@ -6,11 +6,9 @@ import 'Core/http_config.dart';
 import 'Core/type_definitions.dart';
 import 'Data/DataSource/RemoteDataSource/chapa_remote_data_source.dart';
 import 'Data/DataSource/RemoteDataSource/chapa_remote_data_source_impl.dart';
-
 import 'Data/Repository/chapa_repo_impl.dart';
 import 'Domain/Entities/authorization_entity.dart';
 import 'Domain/Entities/chapa_initializer_entity.dart';
-
 import 'Domain/Repository/chapa_repo.dart';
 import 'Domain/Usecase/intialize_usecase.dart';
 import 'Domain/Usecase/verify_usecase.dart';
@@ -97,7 +95,7 @@ class Chapa {
       String errorMsg,
     )? onInAppPaymentError,
     required String amount,
-    required String currency,
+    String currency = 'ETB',
     String? txRef,
     String? email,
     String? firstName,