new project stable version

lib/domain/usecase/purchase_certificate_usecase.dart

@@ -0,0 +1,19 @@
+import '../entities/certificate.dart';
+import '../repositories/certificate_repository.dart';
+import '../../core/result.dart';
+
+class PurchaseCertificateUsecase {
+  final CertificateRepository repository;
+
+  PurchaseCertificateUsecase(this.repository);
+
+  Future<Result<Map<String, dynamic>>> call({
+    required int certificateId,
+    required int cardId,
+  }) async {
+    return await repository.purchaseCertificate(
+      certificateId: certificateId,
+      cardId: cardId,
+    );
+  }
+}