diff --git a/tests/Feature/Billing/BillingPaymentServiceCreditPackTest.php b/tests/Feature/Billing/BillingPaymentServiceCreditPackTest.php
new file mode 100644
index 0000000..bf087d1
--- /dev/null
+++ b/tests/Feature/Billing/BillingPaymentServiceCreditPackTest.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Billing\BillingPaymentService;
+use App\Billing\CheckoutSessionDto;
+use App\Billing\Gateway\FakeSubscriptionCheckoutGateway;
+use App\Billing\Gateway\SubscriptionCheckoutGateway;
+use App\Data\Billing\CreditPackDto;
+use App\Models\User;
+use App\Services\Billing\CreditPackRepository;
+
+beforeEach(function () {
+    app()->bind(SubscriptionCheckoutGateway::class, FakeSubscriptionCheckoutGateway::class);
+
+    config()->set('billing.credit_packs.small.stripe_price_id', 'price_small_test');
+});
+
+it('creates credit pack checkout for user', function () {
+    $user = User::factory()->create();
+    $pack = app(CreditPackRepository::class)->findOrFail('small');
+
+    $checkout = app(BillingPaymentService::class)->createCreditPackCheckout(
+        user: $user,
+        pack: $pack,
+        successUrl: 'https://example.test/billing/credits/success',
+        cancelUrl: 'https://example.test/billing/credits/cancel',
+    );
+
+    expect($checkout)->toBeInstanceOf(CheckoutSessionDto::class);
+    expect($checkout->url)->not->toBeEmpty();
+});
+
+it('rejects credit pack with no stripe price id', function () {
+    $user = User::factory()->create();
+    $pack = new CreditPackDto(
+        key: 'small',
+        label: '500 Credits',
+        credits: 500,
+        stripePriceId: null,
+        description: 'Test',
+    );
+
+    app(BillingPaymentService::class)->createCreditPackCheckout(
+        user: $user,
+        pack: $pack,
+        successUrl: 'https://example.test/success',
+        cancelUrl: 'https://example.test/cancel',
+    );
+})->throws(InvalidArgumentException::class);