implemented TPIN and quick pay within bank

lib/api/services/auth_service.dart

@@ -51,4 +51,43 @@ class AuthService {
     }
   }
 
+  Future<bool> checkTpin() async {
+    try {
+      final response = await _dio.get('/api/auth/tpin');
+      
+      if (response.statusCode == 200) {
+        return response.data['tpinSet'] as bool;
+      } else {
+        throw AuthException('Failed to check TPIN status');
+      }
+    } on DioException catch (e) {
+      if (kDebugMode) {
+        print(e.toString());
+      }
+      throw NetworkException('Network error during TPIN check');
+    } catch (e) {
+      throw UnexpectedException('Unexpected error during TPIN check: ${e.toString()}');
+    }
+  }
+
+  Future<void> setTpin(String tpin) async {
+    try {
+      final response = await _dio.post(
+        '/api/auth/tpin',
+        data: {'tpin': tpin},
+      );
+      
+      if (response.statusCode != 200) {
+        throw AuthException('Failed to set TPIN');
+      }
+    } on DioException catch (e) {
+      if (kDebugMode) {
+        print(e.toString());
+      }
+      throw NetworkException('Network error during TPIN setup');
+    } catch (e) {
+      throw UnexpectedException('Unexpected error during TPIN setup: ${e.toString()}');
+    }
+  }
+
 }