diff --git a/TASKS.md b/TASKS.md
index d6fc4c6..ae29d51 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -176,25 +176,25 @@
   - [ ] Edit invoice (before sending)
   - [x] Void/refund invoice
   - [ ] Resend invoice email
-- [ ] Coupon management:
-  - [ ] Create coupon (percentage, fixed, applies to plans)
-  - [ ] Edit coupon details
+- [x] Coupon management:
+  - [x] Create coupon (percentage, fixed, applies to plans)
+  - [x] Edit coupon details
   - [ ] View redemption history
-  - [ ] Deactivate/delete coupon
+  - [x] Deactivate/delete coupon
 - [x] Plan management:
   - [x] Create new plan (set pricing, features, billing cycle)
   - [x] Edit existing plan
   - [x] Archive/hide plan
   - [x] Set stock quantity (for limited dedicated servers)
-- [ ] System configuration:
+- [x] System configuration:
   - [ ] Email template editor
   - [ ] Tax rate configuration (by region)
-  - [ ] Suspension policy settings (days before suspend/terminate)
+  - [x] Suspension policy settings (days before suspend/terminate)
   - [ ] Bandwidth overage rates
   - [ ] Discord webhook URLs
   - [ ] API credentials (VirtFusion, Pterodactyl, etc.)
-- [ ] Audit log viewer:
-  - [ ] Filter by user, action, date
+- [x] Audit log viewer:
+  - [x] Filter by user, action, date
   - [ ] View changes (before/after state)
   - [ ] Export logs
 
diff --git a/website/app/Http/Controllers/Admin/CustomerController.php b/website/app/Http/Controllers/Admin/CustomerController.php
index bff5390..6c24216 100644
--- a/website/app/Http/Controllers/Admin/CustomerController.php
+++ b/website/app/Http/Controllers/Admin/CustomerController.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Http\Controllers\Admin;
 
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Admin\UpdateCustomerRequest;
 use App\Models\AuditLog;
 use App\Models\User;
 use Illuminate\Http\RedirectResponse;
@@ -109,6 +110,48 @@ class CustomerController extends Controller
         ]);
     }
 
+    public function edit(User $user): Response
+    {
+        return Inertia::render('Admin/Customers/Edit', [
+            'customer' => $user,
+        ]);
+    }
+
+    public function update(UpdateCustomerRequest $request, User $user): RedirectResponse
+    {
+        $oldStatus = $user->status;
+
+        $user->update($request->validated());
+
+        // Log status change if it occurred
+        if ($oldStatus !== $user->status) {
+            AuditLog::create([
+                'user_id' => $user->id,
+                'admin_id' => $request->user()->id,
+                'action' => 'customer_status_changed',
+                'resource_type' => 'user',
+                'resource_id' => $user->id,
+                'ip_address' => $request->ip(),
+                'user_agent' => $request->userAgent(),
+                'changes' => ['old_status' => $oldStatus, 'new_status' => $user->status],
+            ]);
+        }
+
+        AuditLog::create([
+            'user_id' => $user->id,
+            'admin_id' => $request->user()->id,
+            'action' => 'customer_updated',
+            'resource_type' => 'user',
+            'resource_id' => $user->id,
+            'ip_address' => $request->ip(),
+            'user_agent' => $request->userAgent(),
+            'changes' => $request->validated(),
+        ]);
+
+        return redirect()->route('customers.show', $user)
+            ->with('success', 'Customer updated successfully.');
+    }
+
     public function suspend(User $user): RedirectResponse
     {
         $user->update(['status' => 'suspended']);
diff --git a/website/app/Http/Requests/Admin/UpdateCustomerRequest.php b/website/app/Http/Requests/Admin/UpdateCustomerRequest.php
new file mode 100644
index 0000000..cb6cc56
--- /dev/null
+++ b/website/app/Http/Requests/Admin/UpdateCustomerRequest.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Requests\Admin;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateCustomerRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true; // admin middleware handles auth
+    }
+
+    /** @return array<string, array<int, mixed>> */
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'email' => ['required', 'email', 'max:255', Rule::unique('users')->ignore($this->route('user'))],
+            'phone' => ['nullable', 'string', 'max:50'],
+            'company' => ['nullable', 'string', 'max:255'],
+            'status' => ['required', 'in:active,suspended,banned'],
+            'admin_notes' => ['nullable', 'string', 'max:10000'],
+        ];
+    }
+}
diff --git a/website/app/Models/User.php b/website/app/Models/User.php
index 8684400..006ce18 100644
--- a/website/app/Models/User.php
+++ b/website/app/Models/User.php
@@ -28,6 +28,7 @@ class User extends Authenticatable implements MustVerifyEmail
         'status',
         'phone',
         'company',
+        'admin_notes',
     ];
 
     /** @var list<string> */
diff --git a/website/database/migrations/2026_02_10_010036_add_admin_notes_to_users_table.php b/website/database/migrations/2026_02_10_010036_add_admin_notes_to_users_table.php
new file mode 100644
index 0000000..0e9c814
--- /dev/null
+++ b/website/database/migrations/2026_02_10_010036_add_admin_notes_to_users_table.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+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::table('users', function (Blueprint $table): void {
+            $table->text('admin_notes')->nullable()->after('company');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table): void {
+            $table->dropColumn('admin_notes');
+        });
+    }
+};
diff --git a/website/resources/ts/Pages/Admin/Customers/Edit.vue b/website/resources/ts/Pages/Admin/Customers/Edit.vue
new file mode 100644
index 0000000..1bd98a9
--- /dev/null
+++ b/website/resources/ts/Pages/Admin/Customers/Edit.vue
@@ -0,0 +1,153 @@
+<script lang="ts" setup>
+import { Link, useForm } from '@inertiajs/vue3'
+import AdminLayout from '@/Layouts/AdminLayout.vue'
+import AppTextField from '@/Components/app-form-elements/AppTextField.vue'
+import AppSelect from '@/Components/app-form-elements/AppSelect.vue'
+import AppTextarea from '@/Components/app-form-elements/AppTextarea.vue'
+import type { User } from '@/types'
+
+defineOptions({ layout: AdminLayout })
+
+interface Props {
+  customer: User
+}
+
+const props = defineProps<Props>()
+
+const form = useForm({
+  name: props.customer.name,
+  email: props.customer.email,
+  phone: props.customer.phone ?? '',
+  company: props.customer.company ?? '',
+  status: props.customer.status,
+  admin_notes: props.customer.admin_notes ?? '',
+})
+
+const statusOptions = [
+  { title: 'Active', value: 'active' },
+  { title: 'Suspended', value: 'suspended' },
+  { title: 'Banned', value: 'banned' },
+]
+
+function submit(): void {
+  form.put(`/customers/${props.customer.id}`)
+}
+</script>
+
+<template>
+  <div>
+    <!-- Header -->
+    <div class="d-flex align-center justify-space-between mb-6">
+      <div>
+        <div class="d-flex align-center gap-2 mb-1">
+          <Link :href="`/customers/${customer.id}`" class="text-decoration-none">
+            <VBtn icon="tabler-arrow-left" variant="text" size="small" />
+          </Link>
+          <span class="text-h4 font-weight-bold">Edit Customer</span>
+        </div>
+        <div class="text-body-2 text-medium-emphasis ms-10">
+          Update details for "{{ customer.name }}"
+        </div>
+      </div>
+    </div>
+
+    <form @submit.prevent="submit">
+      <VRow>
+        <!-- Customer Details -->
+        <VCol cols="12" lg="8">
+          <VCard title="Customer Details" class="mb-6">
+            <VCardText>
+              <VRow>
+                <VCol cols="12" md="6">
+                  <AppTextField
+                    v-model="form.name"
+                    label="Name"
+                    placeholder="Full name"
+                    :error-messages="form.errors.name"
+                  />
+                </VCol>
+                <VCol cols="12" md="6">
+                  <AppTextField
+                    v-model="form.email"
+                    label="Email"
+                    type="email"
+                    placeholder="email@example.com"
+                    :error-messages="form.errors.email"
+                  />
+                </VCol>
+                <VCol cols="12" md="6">
+                  <AppTextField
+                    v-model="form.phone"
+                    label="Phone"
+                    placeholder="Phone number"
+                    :error-messages="form.errors.phone"
+                  />
+                </VCol>
+                <VCol cols="12" md="6">
+                  <AppTextField
+                    v-model="form.company"
+                    label="Company"
+                    placeholder="Company name"
+                    :error-messages="form.errors.company"
+                  />
+                </VCol>
+                <VCol cols="12" md="6">
+                  <AppSelect
+                    v-model="form.status"
+                    label="Status"
+                    :items="statusOptions"
+                    :error-messages="form.errors.status"
+                  />
+                </VCol>
+              </VRow>
+            </VCardText>
+          </VCard>
+
+          <!-- Admin Notes -->
+          <VCard title="Admin Notes" class="mb-6">
+            <VCardText>
+              <AppTextarea
+                v-model="form.admin_notes"
+                label="Internal Notes"
+                placeholder="Add internal notes about this customer (only visible to admins)..."
+                rows="4"
+                :error-messages="form.errors.admin_notes"
+              />
+              <div class="text-caption text-medium-emphasis mt-2">
+                These notes are only visible to administrators and will not be shown to the customer.
+              </div>
+            </VCardText>
+          </VCard>
+        </VCol>
+
+        <!-- Sidebar -->
+        <VCol cols="12" lg="4">
+          <!-- Actions -->
+          <VCard>
+            <VCardText>
+              <VBtn
+                type="submit"
+                color="primary"
+                block
+                :loading="form.processing"
+                :disabled="form.processing"
+                prepend-icon="tabler-check"
+                class="mb-3"
+              >
+                Save Changes
+              </VBtn>
+              <Link :href="`/customers/${customer.id}`" class="text-decoration-none">
+                <VBtn
+                  variant="outlined"
+                  block
+                >
+                  Cancel
+                </VBtn>
+              </Link>
+            </VCardText>
+          </VCard>
+        </VCol>
+      </VRow>
+    </form>
+  </div>
+</template>
diff --git a/website/resources/ts/Pages/Admin/Customers/Show.vue b/website/resources/ts/Pages/Admin/Customers/Show.vue
index 39c5ecf..82d2865 100644
--- a/website/resources/ts/Pages/Admin/Customers/Show.vue
+++ b/website/resources/ts/Pages/Admin/Customers/Show.vue
@@ -23,6 +23,7 @@ interface Customer {
   email: string
   phone: string | null
   company: string | null
+  admin_notes: string | null
   status: string
   created_at: string
   email_verified_at: string | null
@@ -230,6 +231,16 @@ function formatBillingAddress(profile: CustomerProfile | null): string {
           </div>
 
           <div class="d-flex align-center ga-2">
+            <Link :href="`/customers/${customer.id}/edit`" class="text-decoration-none">
+              <VBtn
+                color="primary"
+                variant="tonal"
+                size="small"
+              >
+                <VIcon icon="tabler-edit" start />
+                Edit
+              </VBtn>
+            </Link>
             <VBtn
               color="info"
               variant="tonal"
@@ -390,6 +401,19 @@ function formatBillingAddress(profile: CustomerProfile | null): string {
               </VCardText>
             </VCard>
 
+            <!-- Admin Notes -->
+            <VCard v-if="customer.admin_notes" class="mb-4">
+              <VCardTitle class="d-flex align-center gap-2">
+                <VIcon icon="tabler-notes" size="22" />
+                <span>Admin Notes</span>
+              </VCardTitle>
+              <VCardText>
+                <div class="text-body-2" style="white-space: pre-line;">
+                  {{ customer.admin_notes }}
+                </div>
+              </VCardText>
+            </VCard>
+
             <!-- Quick Stats -->
             <VCard>
               <VCardTitle class="d-flex align-center gap-2">
diff --git a/website/resources/ts/types/index.ts b/website/resources/ts/types/index.ts
index 4a5e446..b74d857 100644
--- a/website/resources/ts/types/index.ts
+++ b/website/resources/ts/types/index.ts
@@ -4,6 +4,7 @@ export interface User {
   email: string
   phone: string | null
   company: string | null
+  admin_notes?: string | null
   status: string
   two_factor_enabled?: boolean
 }
diff --git a/website/routes/admin.php b/website/routes/admin.php
index 8f3a4b1..f6210d2 100644
--- a/website/routes/admin.php
+++ b/website/routes/admin.php
@@ -17,7 +17,7 @@ use Illuminate\Support\Facades\Route;
 
 Route::get('/dashboard', [DashboardController::class, 'index'])->name('admin.dashboard');
 
-Route::resource('customers', CustomerController::class)->only(['index', 'show']);
+Route::resource('customers', CustomerController::class)->only(['index', 'show', 'edit', 'update'])->parameters(['customers' => 'user']);
 Route::post('customers/{user}/suspend', [CustomerController::class, 'suspend'])->name('customers.suspend');
 Route::post('customers/{user}/unsuspend', [CustomerController::class, 'unsuspend'])->name('customers.unsuspend');
 
diff --git a/website/tests/Feature/Admin/CustomerEditTest.php b/website/tests/Feature/Admin/CustomerEditTest.php
new file mode 100644
index 0000000..78bb55f
--- /dev/null
+++ b/website/tests/Feature/Admin/CustomerEditTest.php
@@ -0,0 +1,131 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\AuditLog;
+use App\Models\User;
+use Database\Seeders\RoleAndPermissionSeeder;
+
+beforeEach(function (): void {
+    $this->seed(RoleAndPermissionSeeder::class);
+    $this->adminUrl = 'http://'.config('app.domains.admin');
+    $this->admin = User::factory()->admin()->create();
+    $this->customer = User::factory()->customer()->create([
+        'name' => 'Original Name',
+        'email' => 'original@test.com',
+    ]);
+});
+
+test('admin can view customer edit page', function (): void {
+    $this->actingAs($this->admin)
+        ->get($this->adminUrl.'/customers/'.$this->customer->id.'/edit')
+        ->assertOk()
+        ->assertInertia(fn ($page) => $page
+            ->component('Admin/Customers/Edit')
+            ->has('customer')
+        );
+});
+
+test('admin can update customer details', function (): void {
+    $this->actingAs($this->admin)
+        ->put($this->adminUrl.'/customers/'.$this->customer->id, [
+            'name' => 'Updated Name',
+            'email' => 'updated@test.com',
+            'phone' => '555-1234',
+            'company' => 'Test Corp',
+            'status' => 'active',
+            'admin_notes' => 'Test note from admin',
+        ])
+        ->assertRedirect();
+
+    $this->customer->refresh();
+    expect($this->customer->name)->toBe('Updated Name')
+        ->and($this->customer->email)->toBe('updated@test.com')
+        ->and($this->customer->phone)->toBe('555-1234')
+        ->and($this->customer->company)->toBe('Test Corp')
+        ->and($this->customer->admin_notes)->toBe('Test note from admin');
+});
+
+test('admin can update customer status', function (): void {
+    $this->actingAs($this->admin)
+        ->put($this->adminUrl.'/customers/'.$this->customer->id, [
+            'name' => $this->customer->name,
+            'email' => $this->customer->email,
+            'status' => 'suspended',
+        ])
+        ->assertRedirect();
+
+    $this->customer->refresh();
+    expect($this->customer->status)->toBe('suspended');
+
+    // Check audit log for status change
+    expect(AuditLog::where('action', 'customer_status_changed')->count())->toBeGreaterThan(0);
+});
+
+test('customer edit requires valid email', function (): void {
+    $this->actingAs($this->admin)
+        ->put($this->adminUrl.'/customers/'.$this->customer->id, [
+            'name' => 'Test',
+            'email' => 'not-an-email',
+            'status' => 'active',
+        ])
+        ->assertSessionHasErrors('email');
+});
+
+test('customer edit requires unique email', function (): void {
+    User::factory()->customer()->create(['email' => 'taken@test.com']);
+
+    $this->actingAs($this->admin)
+        ->put($this->adminUrl.'/customers/'.$this->customer->id, [
+            'name' => 'Test',
+            'email' => 'taken@test.com',
+            'status' => 'active',
+        ])
+        ->assertSessionHasErrors('email');
+});
+
+test('customer can keep their own email on update', function (): void {
+    $this->actingAs($this->admin)
+        ->put($this->adminUrl.'/customers/'.$this->customer->id, [
+            'name' => 'Updated',
+            'email' => $this->customer->email,
+            'status' => 'active',
+        ])
+        ->assertRedirect();
+});
+
+test('admin notes can be saved and cleared', function (): void {
+    // Save notes
+    $this->actingAs($this->admin)
+        ->put($this->adminUrl.'/customers/'.$this->customer->id, [
+            'name' => $this->customer->name,
+            'email' => $this->customer->email,
+            'status' => 'active',
+            'admin_notes' => 'Important customer note',
+        ])
+        ->assertRedirect();
+
+    $this->customer->refresh();
+    expect($this->customer->admin_notes)->toBe('Important customer note');
+
+    // Clear notes
+    $this->actingAs($this->admin)
+        ->put($this->adminUrl.'/customers/'.$this->customer->id, [
+            'name' => $this->customer->name,
+            'email' => $this->customer->email,
+            'status' => 'active',
+            'admin_notes' => '',
+        ])
+        ->assertRedirect();
+
+    $this->customer->refresh();
+    expect($this->customer->admin_notes)->toBeNull();
+});
+
+test('non-admin cannot access customer edit', function (): void {
+    $regularUser = User::factory()->customer()->create();
+
+    $this->actingAs($regularUser)
+        ->get($this->adminUrl.'/customers/'.$this->customer->id.'/edit')
+        ->assertForbidden();
+});
diff --git a/website/tests/Feature/Models/UserTest.php b/website/tests/Feature/Models/UserTest.php
index 9cfb110..3400e03 100644
--- a/website/tests/Feature/Models/UserTest.php
+++ b/website/tests/Feature/Models/UserTest.php
@@ -14,7 +14,7 @@ it('has correct fillable attributes', function (): void {
     $user = new User;
 
     expect($user->getFillable())->toBe([
-        'name', 'email', 'password', 'status', 'phone', 'company',
+        'name', 'email', 'password', 'status', 'phone', 'company', 'admin_notes',
     ]);
 });