apps/ex02 transaction verify

apps/ex00_checkout_basic/.gitignore

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+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/
+.env

apps/ex00_checkout_basic/CHANGELOG.md

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+## 1.0.0
+
+- Initial version.

apps/ex00_checkout_basic/README.md

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+A sample command-line application with an entrypoint in `bin/`, library code
+in `lib/`, and example unit test in `test/`.

apps/ex00_checkout_basic/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

apps/ex00_checkout_basic/bin/ex00_checkout_basic.dart

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+import 'package:ex00_checkout_basic/ex00_checkout_basic.dart'
+    as ex00_checkout_basic;
+
+import 'dart:io';
+
+void main(List<String> args) async {
+  final example = await ex00_checkout_basic.BasicCheckoutExample.create();
+
+  stdout.writeln('=== Basic Checkout Example ===');
+  stdout.writeln('Enter customer email:');
+  final email = stdin.readLineSync();
+  if (email == null || email.isEmpty) {
+    stderr.writeln('Email is required.');
+    exit(1);
+  }
+
+  stdout.writeln('Enter amount in Naira:');
+  final amountInput = stdin.readLineSync();
+  final amountNaira = int.tryParse(amountInput ?? '');
+  if (amountNaira == null || amountNaira <= 0) {
+    stderr.writeln('Invalid amount.');
+    exit(1);
+  }
+
+  final amountKobo = amountNaira * 100;
+
+  await example.startCheckout(email: email, amountKobo: amountKobo);
+
+  stdout.writeln('\n=== Optional: Verify payment ===');
+  stdout.writeln('Enter reference to verify (or press Enter to skip):');
+  final ref = stdin.readLineSync();
+  if (ref != null && ref.isNotEmpty) {
+    await example.verify(ref);
+  }
+
+  stdout.writeln('Done.');
+}

apps/ex00_checkout_basic/lib/ex00_checkout_basic.dart

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+import 'dart:io';
+
+import 'package:dotenv/dotenv.dart';
+import 'package:mind_paystack/mind_paystack.dart';
+
+class BasicCheckoutExample {
+  final TransactionService transactionService;
+
+  BasicCheckoutExample({required this.transactionService});
+
+  /// Initialize transaction and print the checkout URL
+  Future<void> startCheckout({
+    required String email,
+    required int amountKobo,
+    String currency = 'NGN',
+  }) async {
+    final reference = 'txn_${DateTime.now().millisecondsSinceEpoch}';
+
+    stdout.writeln('Initializing transaction...');
+    final tx = await transactionService.initializeTransaction(
+      amount: amountKobo,
+      email: email,
+      currency: currency,
+      reference: reference,
+    );
+
+    stdout.writeln('Transaction initialized successfully!');
+    stdout.writeln('Reference: $reference');
+    stdout.writeln('Open this URL to complete payment:');
+    stdout.writeln(tx.authorizationUrl);
+  }
+
+  /// Verify transaction after payment
+  Future<void> verify(String reference) async {
+    stdout.writeln('Verifying transaction $reference...');
+    final verifyResponse = await transactionService.verifyTransaction(
+      reference,
+    );
+    stdout.writeln('Payment status: ${verifyResponse.status}');
+    stdout.writeln('Full response: $verifyResponse');
+  }
+
+  /// Factory method to create instance with credentials loaded from .env
+  static Future<BasicCheckoutExample> create() async {
+    final env = DotEnv(includePlatformEnvironment: true)..load();
+    final secretKey = env['PAYSTACK_SECRET_KEY'];
+    final publicKey = env['PAYSTACK_PUBLIC_KEY'];
+    if (secretKey == null || secretKey.isEmpty) {
+      stderr.writeln('Error: PAYSTACK_SECRET_KEY not set in .env');
+      exit(1);
+    } else if (publicKey == null || publicKey.isEmpty) {
+      stderr.writeln('Error: PAYSTACK_PUBLIC_KEY not set in .env');
+      exit(1);
+    }
+
+    // Here you might pass repository into TransactionService if your SDK requires it
+    MindPaystack.init(
+      PaystackConfig(publicKey: publicKey, secretKey: secretKey),
+    );
+    final mindPaystack = MindPaystack.instance;
+    return BasicCheckoutExample(transactionService: mindPaystack.transaction);
+  }
+}