diff --git a/app/Actions/Billing/StartSubscriptionCheckout.php b/app/Actions/Billing/StartSubscriptionCheckout.php
index d49d9c0c7..c7a066b72 100644
--- a/app/Actions/Billing/StartSubscriptionCheckout.php
+++ b/app/Actions/Billing/StartSubscriptionCheckout.php
@@ -6,6 +6,7 @@
 
 use App\Models\Account;
 use App\Support\Billing\ConfigureSubscriptionCheckout;
+use Illuminate\Support\Str;
 use Inertia\Inertia;
 use Symfony\Component\HttpFoundation\Response;
 
@@ -16,8 +17,11 @@ class StartSubscriptionCheckout
      * redirect to it. Quantity tracks the account's workspace count. Trial days,
      * optional first-month coupon, and promotion codes come from cashier /
      * trypost billing env config via ConfigureSubscriptionCheckout. The owner's
-     * signup attribution and onboarding answers ride along as subscription
-     * metadata, flattened to the strings Stripe accepts.
+     * signup attribution -- UTM parameters and ad click IDs -- and onboarding
+     * answers ride along as subscription metadata, flattened to the strings
+     * Stripe stores and cut to the 500 characters it allows per value. Stripe
+     * rejects a longer value outright rather than truncating it, which would
+     * fail the whole checkout: https://docs.stripe.com/api/metadata
      */
     public function redirect(Account $account, string $priceId, string $cancelUrl): Response
     {
@@ -28,18 +32,29 @@ public function redirect(Account $account, string $priceId, string $cancelUrl):
 
         $owner = $account->owner;
 
+        $metadata = array_filter([
+            'utm_source' => $owner?->utm_source,
+            'utm_medium' => $owner?->utm_medium,
+            'utm_campaign' => $owner?->utm_campaign,
+            'utm_term' => $owner?->utm_term,
+            'utm_content' => $owner?->utm_content,
+            'gclid' => $owner?->gclid,
+            'fbclid' => $owner?->fbclid,
+            'li_fat_id' => $owner?->li_fat_id,
+            'ttclid' => $owner?->ttclid,
+            'rdt_cid' => $owner?->rdt_cid,
+            'epik' => $owner?->epik,
+            'persona' => $owner?->persona?->value,
+            'goals' => implode(',', $owner?->goals ?? []),
+            'referral_source' => $owner?->referral_source?->value,
+        ]);
+
         $subscription = $account->newSubscription(Account::SUBSCRIPTION_NAME, $priceId)
             ->quantity(max(1, $account->workspaces()->count()))
-            ->withMetadata(array_filter([
-                'utm_source' => $owner?->utm_source,
-                'utm_medium' => $owner?->utm_medium,
-                'utm_campaign' => $owner?->utm_campaign,
-                'utm_term' => $owner?->utm_term,
-                'utm_content' => $owner?->utm_content,
-                'persona' => $owner?->persona?->value,
-                'goals' => implode(',', $owner?->goals ?? []),
-                'referral_source' => $owner?->referral_source?->value,
-            ]));
+            ->withMetadata(array_map(
+                fn (string $value): string => Str::limit($value, 500, ''),
+                $metadata,
+            ));
 
         ConfigureSubscriptionCheckout::apply($subscription, $account);
 
diff --git a/tests/Unit/Actions/Billing/StartSubscriptionCheckoutTest.php b/tests/Unit/Actions/Billing/StartSubscriptionCheckoutTest.php
index 01965625a..f8d37e8bf 100644
--- a/tests/Unit/Actions/Billing/StartSubscriptionCheckoutTest.php
+++ b/tests/Unit/Actions/Billing/StartSubscriptionCheckoutTest.php
@@ -32,6 +32,12 @@
         'utm_campaign' => 'launch',
         'utm_term' => 'social scheduler',
         'utm_content' => 'headline-b',
+        'gclid' => 'Cj0KCQgclid',
+        'fbclid' => 'IwAR0fbclid',
+        'li_fat_id' => '9f2li-fat-id',
+        'ttclid' => 'E.C.Pttclid',
+        'rdt_cid' => 'rdt-cid-value',
+        'epik' => 'dj0yepik',
         'persona' => Persona::Agency,
         'goals' => ['grow_audience', 'save_time'],
         'referral_source' => ReferralSource::ProductHunt,
@@ -50,6 +56,12 @@
             'utm_campaign' => 'launch',
             'utm_term' => 'social scheduler',
             'utm_content' => 'headline-b',
+            'gclid' => 'Cj0KCQgclid',
+            'fbclid' => 'IwAR0fbclid',
+            'li_fat_id' => '9f2li-fat-id',
+            'ttclid' => 'E.C.Pttclid',
+            'rdt_cid' => 'rdt-cid-value',
+            'epik' => 'dj0yepik',
             'persona' => 'agency',
             'goals' => 'grow_audience,save_time',
             'referral_source' => 'product_hunt',
@@ -114,3 +126,38 @@
 
     app(StartSubscriptionCheckout::class)->redirect($accountMock, 'price_monthly_test', $cancelUrl);
 });
+
+test('redirect cuts an oversized click id to the stripe metadata limit', function () {
+    config([
+        'trypost.billing.require_card_for_trial' => true,
+        'cashier.trial_days' => 8,
+        'cashier.first_month_coupon_id' => '',
+        'cashier.allow_promotion_codes' => false,
+    ]);
+
+    $account = Account::factory()->create();
+    Workspace::factory()->create(['account_id' => $account->id]);
+    User::factory()->create([
+        'account_id' => $account->id,
+        'fbclid' => str_repeat('a', 900),
+    ]);
+    $account->refresh();
+
+    $builder = Mockery::mock(SubscriptionBuilder::class);
+    $builder->shouldReceive('quantity')->once()->andReturnSelf();
+    $builder->shouldReceive('withMetadata')
+        ->once()
+        ->with(['fbclid' => str_repeat('a', 500)])
+        ->andReturnSelf();
+    $builder->shouldReceive('trialDays')->once()->andReturnSelf();
+    $builder->shouldReceive('checkout')
+        ->once()
+        ->andReturn((object) ['url' => 'https://checkout.stripe.test/session']);
+
+    /** @var Account&MockInterface $accountMock */
+    $accountMock = Mockery::mock($account)->makePartial();
+    $accountMock->shouldReceive('createOrGetStripeCustomer')->once()->andReturnNull();
+    $accountMock->shouldReceive('newSubscription')->once()->andReturn($builder);
+
+    app(StartSubscriptionCheckout::class)->redirect($accountMock, 'price_monthly_test', route('app.welcome'));
+});