Embed POS checkouts in a modal/sheet using the seller email.

Card/MoMo always initializes with the merchant email, and Paystack/Flutterwave/Hubtel open in-page (desktop modal, mobile bottomsheet) instead of a full redirect.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Feature/PosRegisterTest.php

@@ -7,7 +7,6 @@ use App\Models\PosLocation;
 use App\Models\PosProduct;
 use App\Models\PosSale;
 use App\Models\User;
-use App\Services\Pay\PayClient;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Http;
 use Tests\TestCase;
@@ -122,27 +121,44 @@ class PosRegisterTest extends TestCase
         $this->assertSame(2000, $sale->total_minor);
     }
 
-    public function test_pay_sale_redirects_to_checkout(): void
+    public function test_pay_sale_opens_embedded_checkout(): void
     {
         $user = $this->user();
 
-        $this->mock(PayClient::class, function ($mock) {
-            $mock->shouldReceive('createCheckout')->once()->andReturn([
-                'id' => 99,
-                'reference' => 'LP-TESTREF',
-                'checkout_url' => 'https://checkout.paystack.com/test',
-            ]);
-        });
+        \App\Models\PaymentGatewaySetting::create([
+            'owner_ref' => $user->public_id,
+            'provider' => \App\Models\PaymentGatewaySetting::PROVIDER_PAYSTACK,
+            'public_key' => 'pk_test',
+            'secret_key' => 'sk_test',
+            'is_active' => true,
+        ]);
 
-        $this->actingAs($user)->post(route('pos.register.charge'), [
+        Http::fake([
+            'crm.test/api/customers*' => Http::response(['data' => []], 200),
+            'https://api.paystack.co/transaction/initialize' => Http::response([
+                'status' => true,
+                'data' => [
+                    'authorization_url' => 'https://checkout.paystack.com/test',
+                    'reference' => 'POSS-TESTREF',
+                ],
+            ], 200),
+        ]);
+
+        $response = $this->actingAs($user)->post(route('pos.register.charge'), [
             'payment_method' => 'pay',
             'lines' => [
                 ['name' => 'Snack', 'unit_price_minor' => 500, 'quantity' => 1],
             ],
-        ])->assertRedirect('https://checkout.paystack.com/test');
+        ]);
 
         $sale = PosSale::where('owner_ref', $user->public_id)->first();
-        $this->assertSame('LP-TESTREF', $sale->payment_reference);
+        $this->assertNotNull($sale);
+        $response->assertRedirect(route('pos.sales.show', $sale));
+        $response->assertSessionHas('checkout_url', 'https://checkout.paystack.com/test');
         $this->assertSame(PosSale::STATUS_PENDING, $sale->status);
+        $this->assertNotEmpty($sale->payment_reference);
+
+        Http::assertSent(fn ($r) => str_contains($r->url(), 'paystack.co')
+            && ($r['email'] ?? null) === $user->email);
     }
 }