diff --git a/app/Http/Controllers/Api/SslCallbackController.php b/app/Http/Controllers/Api/SslCallbackController.php
new file mode 100644
index 0000000..e8ebe87
--- /dev/null
+++ b/app/Http/Controllers/Api/SslCallbackController.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Services\CustomDomain\CustomDomainService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * Signed completion callback from Ladill Domains' SSL service. Flips a custom
+ * domain to live (or failed) once the certificate is issued. Auth is the HMAC
+ * signature over the raw body (shared SSL_CALLBACK_SECRET), not a session.
+ */
+class SslCallbackController extends Controller
+{
+    public function __invoke(Request $request, CustomDomainService $service): JsonResponse
+    {
+        $secret = (string) config('customdomain.callback_secret');
+        $body = $request->getContent();
+        $signature = (string) $request->header('X-Ladill-Signature', '');
+
+        if ($secret === '' || ! hash_equals(hash_hmac('sha256', $body, $secret), $signature)) {
+            return response()->json(['error' => 'Invalid signature.'], 401);
+        }
+
+        $payload = json_decode($body, true);
+        $data = (array) ($payload['data'] ?? []);
+        $host = (string) ($data['host'] ?? '');
+        if ($host === '') {
+            return response()->json(['error' => 'Missing host.'], 422);
+        }
+
+        $service->applyCallback(
+            $host,
+            (string) ($data['status'] ?? 'failed'),
+            $data['expires_at'] ?? null,
+            $data['last_error'] ?? null,
+        );
+
+        return response()->json(['status' => 'ok']);
+    }
+}
diff --git a/app/Http/Controllers/Merchant/CustomDomainController.php b/app/Http/Controllers/Merchant/CustomDomainController.php
new file mode 100644
index 0000000..f4ccd3b
--- /dev/null
+++ b/app/Http/Controllers/Merchant/CustomDomainController.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Http\Controllers\Merchant;
+
+use App\Http\Controllers\Controller;
+use App\Models\CustomDomain;
+use App\Models\QrCode;
+use App\Services\CustomDomain\CustomDomainService;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+
+class CustomDomainController extends Controller
+{
+    public function __construct(private readonly CustomDomainService $service) {}
+
+    public function store(Request $request, QrCode $storefront): RedirectResponse
+    {
+        abort_unless($storefront->user_id === $request->user()->id, 403);
+        abort_unless($this->service->enabled(), 404);
+
+        $data = $request->validate([
+            'host' => ['required', 'string', 'max:255', 'regex:/^(?!-)([a-z0-9-]+\.)+[a-z]{2,}$/i'],
+            'include_www' => ['nullable', 'boolean'],
+        ]);
+
+        $host = strtolower(preg_replace('/^www\./', '', trim($data['host'])));
+
+        if (CustomDomain::where('host', $host)->exists()) {
+            return back()->withErrors(['host' => 'That domain is already connected.']);
+        }
+
+        $this->service->attach($storefront, $host, (bool) ($data['include_www'] ?? true));
+
+        return back()->with('success', "Domain added. Point an A record for {$host} (and www) to ".config('customdomain.server_ip').', then click Verify.');
+    }
+
+    public function verify(Request $request, CustomDomain $customDomain): RedirectResponse
+    {
+        abort_unless($customDomain->user_id === $request->user()->id, 403);
+
+        [$ok, $message] = $this->service->verifyAndProvision($customDomain);
+
+        return back()->with($ok ? 'success' : 'error', $message);
+    }
+
+    public function destroy(Request $request, CustomDomain $customDomain): RedirectResponse
+    {
+        abort_unless($customDomain->user_id === $request->user()->id, 403);
+
+        $customDomain->delete();
+
+        return back()->with('success', 'Custom domain removed.');
+    }
+}
diff --git a/app/Http/Controllers/Merchant/StorefrontController.php b/app/Http/Controllers/Merchant/StorefrontController.php
index 3fffe71..4511f1c 100644
--- a/app/Http/Controllers/Merchant/StorefrontController.php
+++ b/app/Http/Controllers/Merchant/StorefrontController.php
@@ -129,6 +129,9 @@ class StorefrontController extends Controller
             'qrCode' => $storefront->fresh(),
             'previewDataUri' => $this->imageGenerator->previewDataUri($storefront),
             'catalog' => $this->catalogProducts(),
+            'customDomains' => \App\Models\CustomDomain::where('qr_code_id', $storefront->id)->get(),
+            'customDomainsEnabled' => app(\App\Services\CustomDomain\CustomDomainService::class)->enabled(),
+            'customDomainServerIp' => config('customdomain.server_ip'),
         ]);
     }
 
diff --git a/app/Models/CustomDomain.php b/app/Models/CustomDomain.php
new file mode 100644
index 0000000..f92cc91
--- /dev/null
+++ b/app/Models/CustomDomain.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * A customer's own domain (e.g. brand.com) pointed at one storefront (QrCode).
+ * Visiting the domain serves that storefront's public page. DNS is verified to
+ * resolve to the app, then Ladill Domains issues + installs the TLS cert.
+ */
+class CustomDomain extends Model
+{
+    public const STATUS_PENDING = 'pending';
+    public const STATUS_ACTIVE = 'active';
+    public const STATUS_FAILED = 'failed';
+
+    protected $fillable = [
+        'qr_code_id', 'user_id', 'host', 'include_www', 'status', 'ssl_status',
+        'dns_verified_at', 'ssl_issued_at', 'ssl_expires_at', 'last_error',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'include_www' => 'boolean',
+            'dns_verified_at' => 'datetime',
+            'ssl_issued_at' => 'datetime',
+            'ssl_expires_at' => 'datetime',
+        ];
+    }
+
+    public function qrCode(): BelongsTo
+    {
+        return $this->belongsTo(QrCode::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function isLive(): bool
+    {
+        return $this->status === self::STATUS_ACTIVE && $this->ssl_status === self::STATUS_ACTIVE;
+    }
+
+    protected static function booted(): void
+    {
+        static::saving(function (CustomDomain $d) {
+            $d->host = strtolower(trim((string) $d->host, " \t\n\r\0\x0B./"));
+            $d->host = preg_replace('/^www\./', '', $d->host) ?: $d->host;
+        });
+    }
+}
diff --git a/app/Services/CustomDomain/CustomDomainService.php b/app/Services/CustomDomain/CustomDomainService.php
new file mode 100644
index 0000000..e4c9d89
--- /dev/null
+++ b/app/Services/CustomDomain/CustomDomainService.php
@@ -0,0 +1,103 @@
+<?php
+
+namespace App\Services\CustomDomain;
+
+use App\Models\CustomDomain;
+use App\Models\QrCode;
+use Illuminate\Support\Carbon;
+
+class CustomDomainService
+{
+    public function __construct(
+        private readonly DnsResolver $dns,
+        private readonly DomainsSslClient $ssl,
+    ) {}
+
+    public function enabled(): bool
+    {
+        return (bool) config('customdomain.enabled', true) && $this->ssl->configured();
+    }
+
+    /** Attach a custom domain to a storefront (pending DNS). */
+    public function attach(QrCode $storefront, string $host, bool $includeWww = true): CustomDomain
+    {
+        return CustomDomain::create([
+            'qr_code_id' => $storefront->id,
+            'user_id' => $storefront->user_id,
+            'host' => $host,
+            'include_www' => $includeWww,
+            'status' => CustomDomain::STATUS_PENDING,
+            'ssl_status' => CustomDomain::STATUS_PENDING,
+        ]);
+    }
+
+    /**
+     * Verify the domain's A record resolves to our app server, then ask Domains
+     * to issue the certificate. Returns [ok, message].
+     *
+     * @return array{0:bool,1:string}
+     */
+    public function verifyAndProvision(CustomDomain $domain): array
+    {
+        $serverIp = (string) config('customdomain.server_ip');
+        $ips = $this->dns->aRecords($domain->host);
+
+        if (! in_array($serverIp, $ips, true)) {
+            $domain->forceFill([
+                'last_error' => 'DNS not pointing to '.$serverIp.' yet (found: '.(implode(', ', $ips) ?: 'none').').',
+            ])->save();
+
+            return [false, 'DNS not verified yet. Add an A record for '.$domain->host.' pointing to '.$serverIp.', then try again.'];
+        }
+
+        $domain->forceFill(['dns_verified_at' => Carbon::now(), 'last_error' => null])->save();
+
+        $requested = $this->ssl->requestCertificate(
+            $domain->host,
+            $domain->include_www,
+            route('api.ssl-callback'),
+        );
+
+        if (! $requested) {
+            $domain->forceFill(['last_error' => 'Could not reach the SSL service. Please try again shortly.'])->save();
+
+            return [false, 'Domain verified, but issuing the certificate failed. Please retry in a moment.'];
+        }
+
+        return [true, 'Domain verified. Issuing your SSL certificate — this usually takes under a minute.'];
+    }
+
+    /** Apply a signed SSL completion callback from Ladill Domains. */
+    public function applyCallback(string $host, string $status, ?string $expiresAt, ?string $error): void
+    {
+        $domain = CustomDomain::where('host', strtolower(trim($host)))->first();
+        if (! $domain) {
+            return;
+        }
+
+        if ($status === 'active') {
+            $domain->forceFill([
+                'ssl_status' => CustomDomain::STATUS_ACTIVE,
+                'status' => CustomDomain::STATUS_ACTIVE,
+                'ssl_issued_at' => Carbon::now(),
+                'ssl_expires_at' => $expiresAt ? Carbon::parse($expiresAt) : null,
+                'last_error' => null,
+            ])->save();
+        } else {
+            $domain->forceFill([
+                'ssl_status' => CustomDomain::STATUS_FAILED,
+                'status' => CustomDomain::STATUS_FAILED,
+                'last_error' => $error ?: 'Certificate issuance failed.',
+            ])->save();
+        }
+    }
+
+    /** Resolve an incoming host to a live storefront, if any. */
+    public function resolveStorefront(string $host): ?QrCode
+    {
+        $host = preg_replace('/^www\./', '', strtolower(trim($host)));
+        $domain = CustomDomain::where('host', $host)->where('status', CustomDomain::STATUS_ACTIVE)->first();
+
+        return $domain?->qrCode;
+    }
+}
diff --git a/app/Services/CustomDomain/DnsResolver.php b/app/Services/CustomDomain/DnsResolver.php
new file mode 100644
index 0000000..bacfde6
--- /dev/null
+++ b/app/Services/CustomDomain/DnsResolver.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Services\CustomDomain;
+
+class DnsResolver
+{
+    /** @return array<int,string> the A-record IPs for a host */
+    public function aRecords(string $host): array
+    {
+        $records = @dns_get_record($host, DNS_A);
+        if (! is_array($records)) {
+            return [];
+        }
+
+        return array_values(array_filter(array_map(fn ($r) => $r['ip'] ?? null, $records)));
+    }
+}
diff --git a/app/Services/CustomDomain/DomainsSslClient.php b/app/Services/CustomDomain/DomainsSslClient.php
new file mode 100644
index 0000000..93237ca
--- /dev/null
+++ b/app/Services/CustomDomain/DomainsSslClient.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace App\Services\CustomDomain;
+
+use Illuminate\Support\Facades\Http;
+use Illuminate\Support\Facades\Log;
+
+/**
+ * Thin client for Ladill Domains' central SSL API. Requests/queries certificates
+ * for a custom domain on the shared app server (target = app).
+ */
+class DomainsSslClient
+{
+    public function configured(): bool
+    {
+        return (string) config('customdomain.ssl_api_key', '') !== '';
+    }
+
+    /**
+     * Ask Domains to issue + install a certificate for $host, calling back when done.
+     */
+    public function requestCertificate(string $host, bool $includeWww, string $callbackUrl): bool
+    {
+        if (! $this->configured()) {
+            return false;
+        }
+
+        try {
+            $res = Http::withToken((string) config('customdomain.ssl_api_key'))
+                ->acceptJson()->timeout(20)
+                ->post(config('customdomain.ssl_api_url').'/ssl/certificates', [
+                    'host' => $host,
+                    'target' => 'app',
+                    'include_www' => $includeWww,
+                    'callback_url' => $callbackUrl,
+                    'metadata' => ['nginx_include' => config('customdomain.nginx_include')],
+                ]);
+
+            if ($res->failed()) {
+                Log::warning('DomainsSslClient: request failed', ['host' => $host, 'status' => $res->status()]);
+
+                return false;
+            }
+
+            return true;
+        } catch (\Throwable $e) {
+            Log::warning('DomainsSslClient: request error', ['host' => $host, 'error' => $e->getMessage()]);
+
+            return false;
+        }
+    }
+}
diff --git a/config/customdomain.php b/config/customdomain.php
new file mode 100644
index 0000000..3b577b6
--- /dev/null
+++ b/config/customdomain.php
@@ -0,0 +1,27 @@
+<?php
+
+$appHost = parse_url((string) env('APP_URL', 'https://merchant.ladill.com'), PHP_URL_HOST) ?: 'merchant.ladill.com';
+
+return [
+    // Custom domains are opt-in; the feature only surfaces/provisions when a
+    // Domains SSL API key is configured.
+    'enabled' => filter_var(env('CUSTOM_DOMAINS_ENABLED', true), FILTER_VALIDATE_BOOLEAN),
+
+    // This app's own host(s) — requests on any other host are treated as a
+    // customer custom domain and resolved to the mapped storefront.
+    'app_host' => $appHost,
+
+    // Where customers point their A records (apex + www).
+    'server_ip' => env('LADILL_APP_SERVER_IP', '161.97.138.149'),
+
+    // Central SSL provisioning (Ladill Domains).
+    'ssl_api_url' => rtrim(env('DOMAINS_SSL_API_URL', 'https://domains.ladill.com/api'), '/'),
+    'ssl_api_key' => env('DOMAINS_API_KEY_MERCHANT', ''),
+
+    // certbot issues + installs an nginx server block that includes this snippet
+    // (root + fastcgi for the Merchant app) so the custom domain serves this app.
+    'nginx_include' => env('CUSTOM_DOMAINS_NGINX_INCLUDE', '/etc/nginx/snippets/ladill-merchant-app.conf'),
+
+    // Shared secret to verify the signed completion callback from Domains.
+    'callback_secret' => env('SSL_CALLBACK_SECRET', ''),
+];
diff --git a/database/migrations/2026_06_26_210000_create_custom_domains_table.php b/database/migrations/2026_06_26_210000_create_custom_domains_table.php
new file mode 100644
index 0000000..fb24cc6
--- /dev/null
+++ b/database/migrations/2026_06_26_210000_create_custom_domains_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('custom_domains', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('qr_code_id')->constrained('qr_codes')->cascadeOnDelete(); // the storefront
+            $table->foreignId('user_id')->constrained()->cascadeOnDelete();
+            $table->string('host')->unique();
+            $table->boolean('include_www')->default(true);
+            $table->string('status', 16)->default('pending');     // pending | active | failed
+            $table->string('ssl_status', 16)->default('pending');  // pending | active | failed
+            $table->timestamp('dns_verified_at')->nullable();
+            $table->timestamp('ssl_issued_at')->nullable();
+            $table->timestamp('ssl_expires_at')->nullable();
+            $table->text('last_error')->nullable();
+            $table->timestamps();
+
+            $table->index('qr_code_id');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('custom_domains');
+    }
+};
diff --git a/resources/views/merchant/storefronts/show.blade.php b/resources/views/merchant/storefronts/show.blade.php
index 37385bc..8632beb 100644
--- a/resources/views/merchant/storefronts/show.blade.php
+++ b/resources/views/merchant/storefronts/show.blade.php
@@ -94,6 +94,52 @@
                     </script>
                 @endonce
 
+                @if(!empty($customDomainsEnabled))
+                    <div class="rounded-2xl border border-slate-200 bg-white p-5">
+                        <h3 class="text-sm font-semibold text-slate-900">Custom domain</h3>
+                        <p class="mt-1 text-xs text-slate-500">Serve this storefront on your own domain with automatic SSL. Optional — your <span class="break-all">{{ $publicUrl }}</span> link always works.</p>
+
+                        @forelse($customDomains as $cd)
+                            <div class="mt-3 rounded-xl border border-slate-200 p-3">
+                                <div class="flex items-center justify-between gap-2">
+                                    <span class="break-all text-sm font-medium text-slate-900">{{ $cd->host }}</span>
+                                    @php $live = $cd->status === 'active' && $cd->ssl_status === 'active'; @endphp
+                                    <span class="shrink-0 rounded-full px-2 py-0.5 text-[11px] font-medium {{ $live ? 'bg-emerald-50 text-emerald-700' : ($cd->status === 'failed' ? 'bg-red-50 text-red-700' : 'bg-amber-50 text-amber-700') }}">
+                                        {{ $live ? 'Live (SSL)' : ($cd->status === 'failed' ? 'Failed' : 'Pending') }}
+                                    </span>
+                                </div>
+                                @unless($live)
+                                    <p class="mt-2 text-xs text-slate-500">Point an <strong>A record</strong> for <strong>{{ $cd->host }}</strong>@if($cd->include_www) and <strong>www.{{ $cd->host }}</strong>@endif to <strong>{{ $customDomainServerIp }}</strong>, then verify.</p>
+                                    @if($cd->last_error)<p class="mt-1 text-xs text-red-600">{{ $cd->last_error }}</p>@endif
+                                @endunless
+                                <div class="mt-2 flex items-center gap-3">
+                                    @unless($live)
+                                        <form method="post" action="{{ route('merchant.custom-domain.verify', $cd) }}">
+                                            @csrf
+                                            <button class="text-xs font-semibold text-indigo-600 hover:text-indigo-500">Verify &amp; enable SSL</button>
+                                        </form>
+                                    @endunless
+                                    <form method="post" action="{{ route('merchant.custom-domain.destroy', $cd) }}" onsubmit="return confirm('Remove this custom domain?');">
+                                        @csrf @method('DELETE')
+                                        <button class="text-xs font-medium text-slate-500 hover:text-red-600">Remove</button>
+                                    </form>
+                                </div>
+                            </div>
+                        @empty
+                            <form method="post" action="{{ route('merchant.custom-domain.store', $qrCode) }}" class="mt-3 flex items-end gap-2">
+                                @csrf
+                                <div class="flex-1">
+                                    <label class="block text-xs text-slate-500">Your domain</label>
+                                    <input type="text" name="host" placeholder="brand.com" required
+                                           class="mt-1 w-full rounded-xl border-slate-200 text-sm focus:border-indigo-500 focus:ring-indigo-500">
+                                </div>
+                                <button class="rounded-xl bg-slate-900 px-3.5 py-2 text-sm font-semibold text-white hover:bg-slate-800">Add</button>
+                            </form>
+                            @error('host')<p class="mt-1 text-xs text-red-600">{{ $message }}</p>@enderror
+                        @endforelse
+                    </div>
+                @endif
+
                 <form method="post" action="{{ route('merchant.storefronts.destroy', $qrCode) }}"
                       onsubmit="return confirm('Delete this storefront? This cannot be undone.');">
                     @csrf @method('DELETE')
diff --git a/routes/api.php b/routes/api.php
index abcace7..0edf222 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -2,8 +2,12 @@
 
 use App\Http\Controllers\Api\MeController;
 use App\Http\Controllers\Api\QrCodeController;
+use App\Http\Controllers\Api\SslCallbackController;
 use Illuminate\Support\Facades\Route;
 
+// Signed SSL completion callback from Ladill Domains (HMAC-verified, no session).
+Route::post('/ssl-callback', SslCallbackController::class)->name('api.ssl-callback');
+
 Route::middleware(['auth:sanctum', \App\Http\Middleware\SetActingAccount::class])->prefix('v1')->group(function () {
     Route::get('/me', MeController::class);
 
diff --git a/routes/web.php b/routes/web.php
index 58430b0..8d7874d 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -6,6 +6,7 @@ use App\Http\Controllers\Merchant\OrdersController;
 use App\Http\Controllers\Merchant\OverviewController;
 use App\Http\Controllers\Merchant\PayoutsController;
 use App\Http\Controllers\Merchant\ProductController;
+use App\Http\Controllers\Merchant\CustomDomainController;
 use App\Http\Controllers\Merchant\StorefrontController;
 use App\Http\Controllers\NotificationController;
 use App\Http\Controllers\Public\BookingController;
@@ -17,9 +18,17 @@ use App\Http\Controllers\Qr\TeamController;
 use App\Http\Controllers\SearchController;
 use Illuminate\Support\Facades\Route;
 
-Route::get('/', fn () => auth()->check()
-    ? redirect()->route('merchant.dashboard')
-    : redirect()->route('sso.connect'))->name('merchant.root');
+Route::get('/', function (\Illuminate\Http\Request $request) {
+    // A customer's connected custom domain serves its mapped storefront here.
+    $storefront = app(\App\Services\CustomDomain\CustomDomainService::class)->resolveStorefront($request->getHost());
+    if ($storefront) {
+        return app(QrScanController::class)->resolve($request, $storefront->short_code);
+    }
+
+    return auth()->check()
+        ? redirect()->route('merchant.dashboard')
+        : redirect()->route('sso.connect');
+})->name('merchant.root');
 
 Route::get('/login', [SsoLoginController::class, 'connect'])->name('login');
 Route::get('/sso/connect', [SsoLoginController::class, 'connect'])->name('sso.connect');
@@ -64,6 +73,11 @@ Route::middleware(['auth', 'platform.session'])->group(function () {
     Route::get('/storefronts/{storefront}/preview.png', [StorefrontController::class, 'preview'])->name('merchant.storefronts.preview');
     Route::get('/storefronts/{storefront}/download/{format}', [StorefrontController::class, 'download'])->name('merchant.storefronts.download')->whereIn('format', ['png', 'svg', 'pdf']);
 
+    // Custom domains (opt-in): connect a customer's own domain to a storefront.
+    Route::post('/storefronts/{storefront}/custom-domain', [CustomDomainController::class, 'store'])->name('merchant.custom-domain.store');
+    Route::post('/custom-domains/{customDomain}/verify', [CustomDomainController::class, 'verify'])->name('merchant.custom-domain.verify');
+    Route::delete('/custom-domains/{customDomain}', [CustomDomainController::class, 'destroy'])->name('merchant.custom-domain.destroy');
+
     Route::get('/products', [ProductController::class, 'index'])->name('merchant.products.index');
     Route::get('/products/create', [ProductController::class, 'create'])->name('merchant.products.create');
     Route::post('/products', [ProductController::class, 'store'])->name('merchant.products.store');
diff --git a/tests/Feature/CustomDomainTest.php b/tests/Feature/CustomDomainTest.php
new file mode 100644
index 0000000..4f9d95a
--- /dev/null
+++ b/tests/Feature/CustomDomainTest.php
@@ -0,0 +1,124 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\CustomDomain;
+use App\Models\QrCode;
+use App\Models\User;
+use App\Services\CustomDomain\CustomDomainService;
+use App\Services\CustomDomain\DnsResolver;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Http;
+use Tests\TestCase;
+
+class CustomDomainTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private string $serverIp = '161.97.138.149';
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        config([
+            'customdomain.enabled' => true,
+            'customdomain.server_ip' => $this->serverIp,
+            'customdomain.ssl_api_url' => 'https://domains.ladill.com/api',
+            'customdomain.ssl_api_key' => 'merchant-ssl-key',
+            'customdomain.callback_secret' => 'shared-secret',
+        ]);
+    }
+
+    private function storefront(?User $owner = null): QrCode
+    {
+        $owner ??= User::factory()->create();
+
+        return QrCode::create([
+            'user_id' => $owner->id,
+            'short_code' => 'sc'.uniqid(),
+            'type' => QrCode::TYPE_SHOP,
+            'label' => 'My Shop',
+            'is_active' => true,
+        ]);
+    }
+
+    private function fakeDns(array $ips): void
+    {
+        $this->app->bind(DnsResolver::class, fn () => new class($ips) extends DnsResolver {
+            public function __construct(private array $ips) {}
+            public function aRecords(string $host): array { return $this->ips; }
+        });
+    }
+
+    public function test_verify_requests_certificate_when_dns_points_to_app(): void
+    {
+        Http::fake(['*/ssl/certificates' => Http::response(['status' => 'pending'], 202)]);
+        $this->fakeDns([$this->serverIp]);
+
+        $store = $this->storefront();
+        $service = app(CustomDomainService::class);
+        $domain = $service->attach($store, 'brand.com', true);
+
+        [$ok] = $service->verifyAndProvision($domain->fresh());
+
+        $this->assertTrue($ok);
+        $this->assertNotNull($domain->fresh()->dns_verified_at);
+        Http::assertSent(fn ($r) => str_contains($r->url(), '/ssl/certificates')
+            && $r['host'] === 'brand.com' && $r['target'] === 'app');
+    }
+
+    public function test_verify_fails_when_dns_not_pointing(): void
+    {
+        $this->fakeDns(['1.2.3.4']);
+        $store = $this->storefront();
+        $service = app(CustomDomainService::class);
+        $domain = $service->attach($store, 'brand.com', true);
+
+        [$ok, $msg] = $service->verifyAndProvision($domain->fresh());
+
+        $this->assertFalse($ok);
+        $this->assertStringContainsString('DNS', $msg);
+        $this->assertNull($domain->fresh()->dns_verified_at);
+    }
+
+    public function test_signed_callback_marks_domain_live_and_resolves(): void
+    {
+        $store = $this->storefront();
+        $domain = app(CustomDomainService::class)->attach($store, 'brand.com', true);
+
+        $payload = json_encode(['event' => 'ssl.active', 'data' => [
+            'host' => 'brand.com', 'status' => 'active', 'expires_at' => now()->addDays(89)->toIso8601String(),
+        ]], JSON_UNESCAPED_SLASHES);
+        $sig = hash_hmac('sha256', $payload, 'shared-secret');
+
+        $this->call('POST', '/api/ssl-callback', [], [], [], [
+            'HTTP_X-Ladill-Signature' => $sig,
+            'CONTENT_TYPE' => 'application/json',
+        ], $payload)->assertOk();
+
+        $domain->refresh();
+        $this->assertTrue($domain->isLive());
+        $resolved = app(CustomDomainService::class)->resolveStorefront('www.brand.com');
+        $this->assertSame($store->id, $resolved?->id);
+    }
+
+    public function test_callback_rejects_bad_signature(): void
+    {
+        app(CustomDomainService::class)->attach($this->storefront(), 'brand.com', true);
+        $payload = json_encode(['data' => ['host' => 'brand.com', 'status' => 'active']]);
+
+        $this->call('POST', '/api/ssl-callback', [], [], [], [
+            'HTTP_X-Ladill-Signature' => 'wrong', 'CONTENT_TYPE' => 'application/json',
+        ], $payload)->assertStatus(401);
+    }
+
+    public function test_store_requires_storefront_ownership(): void
+    {
+        $store = $this->storefront();
+        $intruder = User::factory()->create();
+
+        $this->actingAs($intruder)
+            ->post(route('merchant.custom-domain.store', $store), ['host' => 'brand.com'])
+            ->assertForbidden();
+    }
+}