diff --git a/app/Http/Controllers/EtsySettingsController.php b/app/Http/Controllers/EtsySettingsController.php
new file mode 100644
index 0000000..ec16bd0
--- /dev/null
+++ b/app/Http/Controllers/EtsySettingsController.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\EtsyAppCredential;
+use App\Models\EtsyConnection;
+use App\Services\Etsy;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+
+class EtsySettingsController extends Controller
+{
+    public function index(Request $request, Etsy $etsy): View
+    {
+        abort_unless($request->user()->role === 'admin', 403);
+
+        return view('settings.index', [
+            'storedCredentials' => EtsyAppCredential::find(1) !== null,
+            'configured' => $etsy->configured(),
+            'redirectUri' => $etsy->redirectUri(),
+        ]);
+    }
+
+    public function update(Request $request): RedirectResponse
+    {
+        abort_unless($request->user()->role === 'admin', 403);
+
+        $credentials = EtsyAppCredential::find(1);
+        $requireCredentials = $credentials === null ? 'required' : 'nullable';
+        $validated = $request->validate([
+            'keystring' => [$requireCredentials, 'string', 'max:255'],
+            'shared_secret' => [$requireCredentials, 'string', 'max:255'],
+        ]);
+
+        $previousKeystring = $credentials?->keystring ?: config('services.etsy.keystring');
+        $credentials ??= new EtsyAppCredential;
+        $credentials->id = 1;
+        $credentials->fill(array_filter($validated, fn (?string $value): bool => filled($value)));
+        $credentials->save();
+
+        $keystringChanged = $previousKeystring !== $credentials->keystring;
+        if ($keystringChanged) {
+            EtsyConnection::query()->delete();
+        }
+
+        return redirect()->route('settings.index')->with('status', $keystringChanged
+            ? 'Etsy credentials saved. Reconnect your shop with the new app key.'
+            : 'Etsy credentials saved.');
+    }
+}
diff --git a/app/Models/EtsyAppCredential.php b/app/Models/EtsyAppCredential.php
new file mode 100644
index 0000000..8c6ff7e
--- /dev/null
+++ b/app/Models/EtsyAppCredential.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\EtsyAppCredentialFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class EtsyAppCredential extends Model
+{
+    /** @use HasFactory<EtsyAppCredentialFactory> */
+    use HasFactory;
+
+    protected $fillable = ['keystring', 'shared_secret'];
+
+    protected $hidden = ['keystring', 'shared_secret'];
+
+    protected function casts(): array
+    {
+        return [
+            'keystring' => 'encrypted',
+            'shared_secret' => 'encrypted',
+        ];
+    }
+}
diff --git a/app/Models/EtsyConnection.php b/app/Models/EtsyConnection.php
index 8bfaf09..fc52590 100644
--- a/app/Models/EtsyConnection.php
+++ b/app/Models/EtsyConnection.php
@@ -8,6 +8,8 @@ class EtsyConnection extends Model
 {
     protected $fillable = ['shop_id', 'shop_name', 'access_token', 'refresh_token', 'expires_at'];
 
+    protected $hidden = ['access_token', 'refresh_token'];
+
     protected function casts(): array
     {
         return [
diff --git a/app/Services/Etsy.php b/app/Services/Etsy.php
index 5bc51bf..5411bd9 100644
--- a/app/Services/Etsy.php
+++ b/app/Services/Etsy.php
@@ -2,6 +2,7 @@
 
 namespace App\Services;
 
+use App\Models\EtsyAppCredential;
 use App\Models\EtsyConnection;
 use Illuminate\Support\Facades\Http;
 use RuntimeException;
@@ -10,9 +11,14 @@ class Etsy
 {
     private const API_URL = 'https://api.etsy.com/v3';
 
+    /** @var array{keystring: ?string, shared_secret: ?string}|null */
+    private ?array $credentials = null;
+
     public function configured(): bool
     {
-        return filled(config('services.etsy.keystring')) && filled(config('services.etsy.shared_secret'));
+        $credentials = $this->credentials();
+
+        return filled($credentials['keystring']) && filled($credentials['shared_secret']);
     }
 
     public function authorizationUrl(string $state, string $verifier): string
@@ -24,7 +30,7 @@ class Etsy
 
         return 'https://www.etsy.com/oauth/connect?'.http_build_query([
             'response_type' => 'code', 'redirect_uri' => $this->redirectUri(),
-            'scope' => 'transactions_r listings_r', 'client_id' => config('services.etsy.keystring'),
+            'scope' => 'transactions_r listings_r', 'client_id' => $this->credentials()['keystring'],
             'state' => $state, 'code_challenge' => $challenge, 'code_challenge_method' => 'S256',
         ], '', '&', PHP_QUERY_RFC3986);
     }
@@ -33,7 +39,7 @@ class Etsy
     {
         $tokens = Http::asForm()->acceptJson()->connectTimeout(3)->timeout(10)
             ->post(self::API_URL.'/public/oauth/token', [
-                'grant_type' => 'authorization_code', 'client_id' => config('services.etsy.keystring'),
+                'grant_type' => 'authorization_code', 'client_id' => $this->credentials()['keystring'],
                 'redirect_uri' => $this->redirectUri(), 'code' => $code, 'code_verifier' => $verifier,
             ])->throw()->json();
         $userId = explode('.', $tokens['access_token'] ?? '')[0];
@@ -77,7 +83,7 @@ class Etsy
         }
         $tokens = Http::asForm()->acceptJson()->connectTimeout(3)->timeout(10)
             ->post(self::API_URL.'/public/oauth/token', [
-                'grant_type' => 'refresh_token', 'client_id' => config('services.etsy.keystring'),
+                'grant_type' => 'refresh_token', 'client_id' => $this->credentials()['keystring'],
                 'refresh_token' => $connection->refresh_token,
             ])->throw()->json();
         if (empty($tokens['access_token']) || empty($tokens['refresh_token'])) {
@@ -93,13 +99,30 @@ class Etsy
 
     private function get(string $path, string $accessToken, array $query = []): array
     {
-        return Http::withHeaders(['x-api-key' => config('services.etsy.keystring').':'.config('services.etsy.shared_secret')])
+        $credentials = $this->credentials();
+
+        return Http::withHeaders(['x-api-key' => $credentials['keystring'].':'.$credentials['shared_secret']])
             ->withToken($accessToken)->acceptJson()->connectTimeout(3)->timeout(10)
             ->get(self::API_URL.'/'.$path, $query)->throw()->json() ?? [];
     }
 
-    private function redirectUri(): string
+    public function redirectUri(): string
     {
         return config('services.etsy.redirect_uri') ?: route('etsy.callback');
     }
+
+    /** @return array{keystring: ?string, shared_secret: ?string} */
+    private function credentials(): array
+    {
+        if ($this->credentials !== null) {
+            return $this->credentials;
+        }
+
+        $stored = EtsyAppCredential::find(1);
+
+        return $this->credentials = [
+            'keystring' => $stored?->keystring ?: config('services.etsy.keystring'),
+            'shared_secret' => $stored?->shared_secret ?: config('services.etsy.shared_secret'),
+        ];
+    }
 }
diff --git a/database/factories/EtsyAppCredentialFactory.php b/database/factories/EtsyAppCredentialFactory.php
new file mode 100644
index 0000000..4f096c3
--- /dev/null
+++ b/database/factories/EtsyAppCredentialFactory.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\EtsyAppCredential;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<EtsyAppCredential>
+ */
+class EtsyAppCredentialFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'keystring' => fake()->bothify('etsy-key-????????'),
+            'shared_secret' => fake()->sha256(),
+        ];
+    }
+}
diff --git a/database/migrations/2026_10_10_180546_create_etsy_app_credentials_table.php b/database/migrations/2026_10_10_180546_create_etsy_app_credentials_table.php
new file mode 100644
index 0000000..578a6c0
--- /dev/null
+++ b/database/migrations/2026_10_10_180546_create_etsy_app_credentials_table.php
@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('etsy_app_credentials', function (Blueprint $table) {
+            $table->id();
+            $table->text('keystring');
+            $table->text('shared_secret');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('etsy_app_credentials');
+    }
+};
diff --git a/database/seeders/EtsyAppCredentialSeeder.php b/database/seeders/EtsyAppCredentialSeeder.php
new file mode 100644
index 0000000..73ca198
--- /dev/null
+++ b/database/seeders/EtsyAppCredentialSeeder.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Database\Seeders;
+
+use App\Models\EtsyAppCredential;
+use Illuminate\Database\Seeder;
+
+class EtsyAppCredentialSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        $keystring = config('services.etsy.keystring');
+        $sharedSecret = config('services.etsy.shared_secret');
+
+        if (filled($keystring) && filled($sharedSecret)) {
+            if (EtsyAppCredential::find(1) === null) {
+                $credentials = new EtsyAppCredential;
+                $credentials->id = 1;
+                $credentials->keystring = $keystring;
+                $credentials->shared_secret = $sharedSecret;
+                $credentials->save();
+            }
+        }
+    }
+}
diff --git a/resources/views/etsy.blade.php b/resources/views/etsy.blade.php
index 122b21c..639ddd7 100644
--- a/resources/views/etsy.blade.php
+++ b/resources/views/etsy.blade.php
@@ -1,8 +1,8 @@
 @extends('layouts.app')
 @section('title', 'Etsy shop')
 @section('content')
-<div class="flex flex-wrap items-end justify-between gap-4"><div><p class="text-xs font-bold uppercase tracking-[.2em] text-brand">Sales</p><h2 class="mt-2 text-2xl font-bold">{{ $connection?->shop_name ?? 'Connect your Etsy shop' }}</h2><p class="mt-1 text-slate-400">Paid orders awaiting dispatch and active listings.</p></div><form method="post" action="{{ route('etsy.connect') }}">@csrf<button class="rounded-xl bg-brand px-4 py-3 text-sm font-semibold text-slate-950 hover:bg-brand/90">{{ $connection ? 'Reconnect Etsy' : 'Connect Etsy' }}</button></form></div>
-@if(! $configured)<div role="alert" class="rounded-xl border border-amber-500/30 bg-amber-500/10 p-4 text-sm text-amber-200">Add ETSY_KEYSTRING and ETSY_SHARED_SECRET to the application environment, then register {{ route('etsy.callback') }} as the Etsy redirect URI.</div>@endif
+<div class="flex flex-wrap items-end justify-between gap-4"><div><p class="text-xs font-bold uppercase tracking-[.2em] text-brand">Sales</p><h2 class="mt-2 text-2xl font-bold">{{ $connection?->shop_name ?? 'Connect your Etsy shop' }}</h2><p class="mt-1 text-slate-400">Paid orders awaiting dispatch and active listings.</p></div>@if($configured)<form method="post" action="{{ route('etsy.connect') }}">@csrf<button class="rounded-xl bg-brand px-4 py-3 text-sm font-semibold text-slate-950 hover:bg-brand/90">{{ $connection ? 'Reconnect Etsy' : 'Connect Etsy' }}</button></form>@else<a href="{{ route('settings.index') }}" class="rounded-xl bg-brand px-4 py-3 text-sm font-semibold text-slate-950 hover:bg-brand/90">Set up Etsy</a>@endif</div>
+@if(! $configured)<div role="alert" class="rounded-xl border border-amber-500/30 bg-amber-500/10 p-4 text-sm text-amber-200">Add your Etsy app key and shared secret in <a class="underline" href="{{ route('settings.index') }}">Settings</a>, then connect your shop.</div>@endif
 @if($integrationError)<div role="alert" class="rounded-xl border border-amber-500/30 bg-amber-500/10 p-4 text-sm text-amber-200">{{ $integrationError }}</div>@endif
 @if($connection)
 <div class="grid gap-4 sm:grid-cols-2"><div class="rounded-2xl border border-slate-800 bg-slate-900 p-6"><p class="text-sm text-slate-400">Awaiting dispatch</p><p class="mt-3 text-4xl font-bold">{{ count($receipts) }}</p></div><div class="rounded-2xl border border-slate-800 bg-slate-900 p-6"><p class="text-sm text-slate-400">Active listings shown</p><p class="mt-3 text-4xl font-bold">{{ count($listings) }}</p></div></div>
diff --git a/resources/views/layouts/app.blade.php b/resources/views/layouts/app.blade.php
index b993aec..d901e89 100644
--- a/resources/views/layouts/app.blade.php
+++ b/resources/views/layouts/app.blade.php
@@ -27,6 +27,7 @@
                 @endif
             @endforeach
             @if(auth()->user()->role === 'admin')
+                <a href="{{ route('settings.index') }}" @class(['shrink-0 rounded-xl px-4 py-3 text-sm font-medium hover:bg-slate-800', 'bg-brand/10 text-brand' => request()->routeIs('settings.*'), 'text-slate-400' => !request()->routeIs('settings.*')])>Settings</a>
                 <a href="{{ route('users.index') }}" @class(['shrink-0 rounded-xl px-4 py-3 text-sm font-medium hover:bg-slate-800', 'bg-brand/10 text-brand' => request()->routeIs('users.*'), 'text-slate-400' => !request()->routeIs('users.*')])>Users</a>
             @endif
         </nav>
diff --git a/resources/views/settings/index.blade.php b/resources/views/settings/index.blade.php
new file mode 100644
index 0000000..a2b6c6b
--- /dev/null
+++ b/resources/views/settings/index.blade.php
@@ -0,0 +1,43 @@
+@extends('layouts.app')
+@section('title', 'Settings')
+@section('content')
+<div>
+    <p class="text-xs font-bold uppercase tracking-[.2em] text-brand">Integrations</p>
+    <h2 class="mt-2 text-2xl font-bold">Etsy app credentials</h2>
+    <p class="mt-1 text-sm text-slate-400">Save the credentials from your Etsy developer app, then connect your shop with OAuth.</p>
+</div>
+
+<section class="rounded-2xl border border-slate-800 bg-slate-900 p-6">
+    <div class="flex flex-wrap items-center justify-between gap-3">
+        <div>
+            <h3 class="text-lg font-semibold">API access</h3>
+            <p class="mt-1 text-sm text-slate-400">{{ $storedCredentials ? 'Credentials saved in the database.' : ($configured ? 'Using server credentials. Save them here to manage them in the dashboard.' : 'No credentials saved yet.') }}</p>
+        </div>
+        <span class="rounded-full px-3 py-1 text-xs font-semibold {{ $configured ? 'bg-emerald-500/10 text-emerald-300' : 'bg-amber-500/10 text-amber-200' }}">{{ $configured ? 'Configured' : 'Setup needed' }}</span>
+    </div>
+
+    <form method="post" action="{{ route('settings.etsy.update') }}" class="mt-6 grid gap-5 md:grid-cols-2">
+        @csrf
+        @method('PUT')
+        <label class="grid gap-2 text-sm text-slate-300">
+            Etsy app keystring
+            <input name="keystring" type="password" autocomplete="new-password" maxlength="255" placeholder="{{ $storedCredentials ? 'Leave blank to keep saved key' : 'Enter your app keystring' }}" class="rounded-xl border border-slate-700 bg-slate-950 px-4 py-3 text-slate-100 placeholder:text-slate-500" {{ $storedCredentials ? '' : 'required' }}>
+        </label>
+        <label class="grid gap-2 text-sm text-slate-300">
+            Etsy shared secret
+            <input name="shared_secret" type="password" autocomplete="new-password" maxlength="255" placeholder="{{ $storedCredentials ? 'Leave blank to keep saved secret' : 'Enter your shared secret' }}" class="rounded-xl border border-slate-700 bg-slate-950 px-4 py-3 text-slate-100 placeholder:text-slate-500" {{ $storedCredentials ? '' : 'required' }}>
+        </label>
+        <div class="md:col-span-2">
+            <button class="rounded-xl bg-brand px-5 py-3 text-sm font-semibold text-slate-950 hover:bg-brand/90">Save credentials</button>
+        </div>
+    </form>
+    <p class="mt-4 text-xs text-slate-500">Saved values are encrypted and are never shown again. Changing the app key disconnects the current Etsy shop.</p>
+</section>
+
+<section class="rounded-2xl border border-slate-800 bg-slate-900 p-6">
+    <h3 class="text-lg font-semibold">OAuth callback</h3>
+    <p class="mt-1 text-sm text-slate-400">Register this exact HTTPS URL in your Etsy developer app.</p>
+    <code class="mt-4 block overflow-x-auto rounded-xl border border-slate-800 bg-slate-950 px-4 py-3 text-sm text-slate-200">{{ $redirectUri }}</code>
+    @if($configured)<a href="{{ route('etsy.index') }}" class="mt-5 inline-flex rounded-xl border border-slate-700 px-4 py-3 text-sm font-semibold text-slate-200 hover:border-brand hover:text-white">Go to Etsy shop</a>@endif
+</section>
+@endsection
diff --git a/routes/web.php b/routes/web.php
index fb9b737..1ec2d4e 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -5,6 +5,7 @@ use App\Http\Controllers\BambuddyController;
 use App\Http\Controllers\DashboardController;
 use App\Http\Controllers\DryerController;
 use App\Http\Controllers\EtsyController;
+use App\Http\Controllers\EtsySettingsController;
 use App\Http\Controllers\FilamentController;
 use App\Http\Controllers\PrinterController;
 use App\Http\Controllers\ShippingController;
@@ -32,6 +33,8 @@ Route::middleware(['auth', EnsureAccountActive::class])->group(function (): void
     Route::get('/etsy', [EtsyController::class, 'index'])->name('etsy.index');
     Route::post('/etsy/connect', [EtsyController::class, 'connect'])->name('etsy.connect');
     Route::get('/etsy/callback', [EtsyController::class, 'callback'])->name('etsy.callback');
+    Route::get('/settings', [EtsySettingsController::class, 'index'])->name('settings.index');
+    Route::put('/settings/etsy', [EtsySettingsController::class, 'update'])->name('settings.etsy.update');
     Route::get('/dryer', [DryerController::class, 'index'])->name('dryer');
     Route::get('/dryer/status', [DryerController::class, 'status'])->name('dryer.status');
     Route::post('/dryer/control', [DryerController::class, 'control'])->name('dryer.control');
diff --git a/tests/Feature/EtsySettingsTest.php b/tests/Feature/EtsySettingsTest.php
new file mode 100644
index 0000000..4c7f2fc
--- /dev/null
+++ b/tests/Feature/EtsySettingsTest.php
@@ -0,0 +1,112 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\EtsyAppCredential;
+use App\Models\EtsyConnection;
+use App\Models\User;
+use Illuminate\Foundation\Testing\LazilyRefreshDatabase;
+use Illuminate\Support\Facades\Http;
+use Tests\TestCase;
+
+class EtsySettingsTest extends TestCase
+{
+    use LazilyRefreshDatabase;
+
+    public function test_only_administrators_can_view_and_change_etsy_credentials(): void
+    {
+        $this->get(route('settings.index'))->assertRedirect(route('login'));
+
+        $user = User::factory()->create();
+        $this->actingAs($user)->get(route('settings.index'))->assertForbidden();
+        $this->actingAs($user)->put(route('settings.etsy.update'), [
+            'keystring' => 'key', 'shared_secret' => 'secret',
+        ])->assertForbidden();
+        $this->assertDatabaseCount('etsy_app_credentials', 0);
+    }
+
+    public function test_administrator_saves_encrypted_credentials_for_oauth_without_exposing_them(): void
+    {
+        config()->set('services.etsy.keystring', 'old-server-key');
+        config()->set('services.etsy.shared_secret', 'old-server-secret');
+        $admin = User::factory()->create(['role' => 'admin']);
+
+        $this->actingAs($admin)->put(route('settings.etsy.update'), [
+            'keystring' => 'saved-key', 'shared_secret' => 'saved-secret',
+        ])->assertRedirect(route('settings.index'))->assertSessionHas('status');
+
+        $credentials = EtsyAppCredential::firstOrFail();
+        $this->assertSame('saved-key', $credentials->keystring);
+        $this->assertSame('saved-secret', $credentials->shared_secret);
+        $this->assertNotSame('saved-key', $credentials->getRawOriginal('keystring'));
+        $this->assertNotSame('saved-secret', $credentials->getRawOriginal('shared_secret'));
+        $this->assertArrayNotHasKey('shared_secret', $credentials->toArray());
+
+        $this->actingAs($admin)->get(route('settings.index'))
+            ->assertOk()->assertSee('Credentials saved in the database.')
+            ->assertDontSee('saved-key')->assertDontSee('saved-secret');
+        $this->actingAs($admin)->post(route('etsy.connect'))
+            ->assertRedirectContains('client_id=saved-key');
+    }
+
+    public function test_oauth_api_requests_use_the_saved_shared_secret(): void
+    {
+        Http::preventStrayRequests();
+        Http::fake([
+            'https://api.etsy.com/v3/public/oauth/token' => Http::response(['access_token' => '123.token', 'refresh_token' => '123.refresh', 'expires_in' => 3600]),
+            'https://api.etsy.com/v3/application/users/123/shops' => Http::response(['shop_id' => 42, 'shop_name' => 'HickLab3D']),
+        ]);
+        config()->set('services.etsy.keystring', 'old-server-key');
+        config()->set('services.etsy.shared_secret', 'old-server-secret');
+        $admin = User::factory()->create(['role' => 'admin']);
+        $this->actingAs($admin)->put(route('settings.etsy.update'), [
+            'keystring' => 'saved-key', 'shared_secret' => 'saved-secret',
+        ])->assertRedirect(route('settings.index'));
+
+        $this->actingAs($admin)->withSession(['etsy_oauth' => [
+            'state' => 'expected', 'verifier' => 'verifier', 'started' => time(),
+        ]])->get(route('etsy.callback', ['state' => 'expected', 'code' => 'code']))
+            ->assertRedirect(route('etsy.index'));
+
+        Http::assertSent(fn ($request) => $request->url() === 'https://api.etsy.com/v3/application/users/123/shops'
+            && $request->hasHeader('x-api-key', 'saved-key:saved-secret'));
+    }
+
+    public function test_initial_credentials_require_both_values(): void
+    {
+        $admin = User::factory()->create(['role' => 'admin']);
+
+        $this->actingAs($admin)->put(route('settings.etsy.update'), [
+            'keystring' => 'key',
+        ])->assertSessionHasErrors('shared_secret');
+        $this->assertDatabaseCount('etsy_app_credentials', 0);
+    }
+
+    public function test_blank_fields_keep_saved_credentials_and_new_key_disconnects_old_shop(): void
+    {
+        $admin = User::factory()->create(['role' => 'admin']);
+        $this->actingAs($admin)->put(route('settings.etsy.update'), [
+            'keystring' => 'first-key', 'shared_secret' => 'first-secret',
+        ])->assertRedirect(route('settings.index'));
+        EtsyConnection::create([
+            'shop_id' => 42,
+            'shop_name' => 'HickLab3D',
+            'access_token' => '123.token',
+            'refresh_token' => '123.refresh',
+            'expires_at' => now()->addHour(),
+        ]);
+
+        $this->actingAs($admin)->put(route('settings.etsy.update'), [
+            'keystring' => '', 'shared_secret' => '',
+        ])->assertRedirect(route('settings.index'));
+        $this->assertSame('first-key', EtsyAppCredential::firstOrFail()->keystring);
+        $this->assertDatabaseCount('etsy_connections', 1);
+
+        $this->actingAs($admin)->put(route('settings.etsy.update'), [
+            'keystring' => 'second-key', 'shared_secret' => '',
+        ])->assertRedirect(route('settings.index'))->assertSessionHas('status');
+        $this->assertSame('second-key', EtsyAppCredential::firstOrFail()->keystring);
+        $this->assertSame('first-secret', EtsyAppCredential::firstOrFail()->shared_secret);
+        $this->assertDatabaseCount('etsy_connections', 0);
+    }
+}