diff --git a/app/Services/Stripe/FakeStripeClient.php b/app/Services/Stripe/FakeStripeClient.php
index 34b9f81..47efe93 100644
--- a/app/Services/Stripe/FakeStripeClient.php
+++ b/app/Services/Stripe/FakeStripeClient.php
@@ -34,6 +34,14 @@ class FakeStripeClient implements StripeClient
      */
     public array $activated = [];
 
+    /**
+     * Every metadata write, in order, so a test can assert that an adopted
+     * orphan was brought up to today's metadata instead of being replaced.
+     *
+     * @var array<int, array{price: string, metadata: array<string, string>}>
+     */
+    public array $metadataUpdates = [];
+
     /**
      * Idempotency key → what was first answered for it, and a fingerprint of
      * what it was first sent with.
@@ -240,6 +248,67 @@ class FakeStripeClient implements StripeClient
         $this->activated[] = $priceId;
     }
 
+    public function activePricesFor(string $productId): array
+    {
+        // No failIfAsked(): createPrice(), the call this one stands in front of,
+        // does not fail either, and a test that scripts an outage for a refund
+        // must not have its catalogue sync change behaviour underneath it.
+        $found = [];
+
+        foreach ($this->prices as $id => $price) {
+            if ($price['product'] !== $productId || in_array($id, $this->archived, true)) {
+                continue;
+            }
+
+            $found[] = [
+                'id' => $id,
+                'unit_amount' => $price['amount'],
+                'currency' => strtoupper($price['currency']),
+                'interval' => $price['interval'],
+                'created' => $price['created'],
+                'metadata' => $price['metadata'],
+            ];
+        }
+
+        return $found;
+    }
+
+    public function updatePriceMetadata(string $priceId, array $metadata): void
+    {
+        if (isset($this->prices[$priceId])) {
+            $this->prices[$priceId]['metadata'] = $metadata;
+        }
+
+        $this->metadataUpdates[] = ['price' => $priceId, 'metadata' => $metadata];
+    }
+
+    /**
+     * A Price that exists at Stripe and in no table of ours — the orphan a run
+     * leaves behind when it dies between Stripe's create and our insert.
+     *
+     * Here rather than in a test file because it is the state the whole adoption
+     * step exists for, and every test that needs it would otherwise reach into
+     * $prices and write the shape by hand.
+     */
+    public function plantPrice(
+        string $id,
+        string $productId,
+        int $amountCents,
+        string $currency,
+        string $interval,
+        array $metadata = [],
+        int $created = 1,
+    ): void {
+        $this->prices[$id] = [
+            'product' => $productId,
+            'amount' => $amountCents,
+            'currency' => $currency,
+            'interval' => $interval,
+            'metadata' => $metadata,
+            'created' => $created,
+        ];
+    }
+
     public function updateSubscriptionPrice(
         string $subscriptionId,
         string $itemId,
diff --git a/app/Services/Stripe/HttpStripeClient.php b/app/Services/Stripe/HttpStripeClient.php
index c24e581..8926f39 100644
--- a/app/Services/Stripe/HttpStripeClient.php
+++ b/app/Services/Stripe/HttpStripeClient.php
@@ -144,6 +144,57 @@ class HttpStripeClient implements StripeClient
             ->throw();
     }
 
+    public function activePricesFor(string $productId): array
+    {
+        $prices = [];
+        $after = null;
+
+        // Paged through to the end, for the same reason invoiceLines() is: Stripe
+        // caps a page at a hundred, and a family Product collects a Price per
+        // version, term, treatment and rate change. Stopping at the first page
+        // would leave an orphan unfound and mint the duplicate anyway.
+        do {
+            $page = $this->request()
+                ->get($this->url('prices'), array_filter([
+                    'product' => $productId,
+                    'active' => 'true',
+                    'type' => 'recurring',
+                    'limit' => 100,
+                    'starting_after' => $after,
+                ], fn ($value) => $value !== null))
+                ->throw()
+                ->json();
+
+            $data = (array) ($page['data'] ?? []);
+
+            foreach ($data as $price) {
+                $prices[] = [
+                    'id' => (string) ($price['id'] ?? ''),
+                    'unit_amount' => (int) ($price['unit_amount'] ?? 0),
+                    'currency' => strtoupper((string) ($price['currency'] ?? '')),
+                    'interval' => (string) ($price['recurring']['interval'] ?? ''),
+                    'created' => (int) ($price['created'] ?? 0),
+                    'metadata' => array_map(
+                        fn ($value) => (string) $value,
+                        (array) ($price['metadata'] ?? []),
+                    ),
+                ];
+            }
+
+            $after = $data === [] ? null : ($data[array_key_last($data)]['id'] ?? null);
+        } while (($page['has_more'] ?? false) === true && $after !== null);
+
+        return $prices;
+    }
+
+    public function updatePriceMetadata(string $priceId, array $metadata): void
+    {
+        $this->request()
+            ->asForm()
+            ->post($this->url('prices/'.$priceId), $this->flatten('metadata', $metadata))
+            ->throw();
+    }
+
     public function updateSubscriptionPrice(
         string $subscriptionId,
         string $itemId,
diff --git a/app/Services/Stripe/StripeClient.php b/app/Services/Stripe/StripeClient.php
index 841db2d..1e06947 100644
--- a/app/Services/Stripe/StripeClient.php
+++ b/app/Services/Stripe/StripeClient.php
@@ -124,6 +124,35 @@ interface StripeClient
         ?string $idempotencyKey = null,
     ): string;
 
+    /**
+     * Every active recurring Price of a Product, as Stripe holds them.
+     *
+     * The half of the catalogue mirror that was missing: nothing here ever asked
+     * Stripe what it already had. A run that created a Price and died before the
+     * row was written left an orphan our table never learned about, and once the
+     * idempotency key expired the next run made a SECOND live Price for the same
+     * money — the exact duplicate the key exists to prevent. See
+     * App\Services\Billing\AdoptStripePrice, which is the only caller.
+     *
+     * Active ones only, because the question being asked is "is there something
+     * here I can sell on?". `currency` comes back UPPER CASE, the way our own
+     * tables hold it.
+     *
+     * @return array<int, array{id: string, unit_amount: int, currency: string, interval: string, created: int, metadata: array<string, string>}>
+     */
+    public function activePricesFor(string $productId): array;
+
+    /**
+     * Write metadata onto a Price that already exists.
+     *
+     * Metadata is one of the few fields a Stripe Price lets you change — the
+     * same property activatePrice() rests on, and the reason the metadata format
+     * is NOT part of a Price's identity. An adopted orphan is brought up to
+     * today's metadata rather than replaced, which is exactly what was done by
+     * hand after 2026-07-29 and keeps Stripe's own dashboard readable.
+     */
+    public function updatePriceMetadata(string $priceId, array $metadata): void;
+
     /** Stop a Price being offered. The Price itself stays, as Stripe requires. */
     public function archivePrice(string $priceId): void;
 
diff --git a/tests/Feature/Billing/StripeIdempotencyKeyTest.php b/tests/Feature/Billing/StripeIdempotencyKeyTest.php
index 36b3c26..ef93691 100644
--- a/tests/Feature/Billing/StripeIdempotencyKeyTest.php
+++ b/tests/Feature/Billing/StripeIdempotencyKeyTest.php
@@ -120,3 +120,78 @@ it('mints a second price rather than blocking when the metadata moved', function
     // AdoptStripePrice, not of the key — see StripePriceAdoptionTest.
     expect($second)->not->toBe($first);
 });
+
+it('pages through every active price of a product', function () {
+    Http::fake([
+        'api.stripe.com/*' => Http::sequence()
+            ->push([
+                'data' => [
+                    ['id' => 'price_a', 'unit_amount' => 3480, 'currency' => 'eur',
+                        'created' => 100, 'recurring' => ['interval' => 'month'],
+                        'metadata' => ['addon' => 'priority_support']],
+                    ['id' => 'price_b', 'unit_amount' => 41760, 'currency' => 'eur',
+                        'created' => 101, 'recurring' => ['interval' => 'year'], 'metadata' => []],
+                ],
+                'has_more' => true,
+            ])
+            ->push([
+                'data' => [
+                    ['id' => 'price_c', 'unit_amount' => 2900, 'currency' => 'eur',
+                        'created' => 102, 'recurring' => ['interval' => 'month'],
+                        'metadata' => ['addon' => 'priority_support', 'tax_treatment' => 'reverse_charge']],
+                ],
+                'has_more' => false,
+            ]),
+    ]);
+
+    $prices = (new HttpStripeClient)->activePricesFor('prod_1');
+
+    expect($prices)->toHaveCount(3)
+        ->and($prices[0])->toBe([
+            'id' => 'price_a',
+            'unit_amount' => 3480,
+            // Upper case, because that is how our own tables hold it and the
+            // comparison in AdoptStripePrice must not have to remember which
+            // side is which.
+            'currency' => 'EUR',
+            'interval' => 'month',
+            'created' => 100,
+            'metadata' => ['addon' => 'priority_support'],
+        ])
+        ->and($prices[2]['id'])->toBe('price_c');
+
+    // The second page has to be asked for, or this reintroduces the very gap it
+    // exists to close — a family product accumulates prices across versions,
+    // terms, treatments and every rate change.
+    Http::assertSent(fn ($request) => str_contains($request->url(), 'starting_after=price_b'));
+
+    // Archived prices are none of our business here: we are looking for
+    // something to SELL on.
+    Http::assertSent(fn ($request) => str_contains($request->url(), 'active=true'));
+});
+
+it('writes metadata onto a price that already exists', function () {
+    Http::fake(['api.stripe.com/*' => Http::response(['id' => 'price_a'])]);
+
+    (new HttpStripeClient)->updatePriceMetadata('price_a', ['addon' => 'priority_support']);
+
+    Http::assertSent(fn ($request) => $request->url() === 'https://api.stripe.com/v1/prices/price_a'
+        && $request['metadata[addon]'] === 'priority_support');
+});
+
+it('lets the fake answer with the prices it holds, minus the archived ones', function () {
+    $fake = new FakeStripeClient;
+
+    $kept = $fake->createPrice('prod_1', 3480, 'EUR', 'month', ['addon' => 'priority_support']);
+    $gone = $fake->createPrice('prod_1', 2900, 'EUR', 'month', ['addon' => 'priority_support']);
+    $other = $fake->createPrice('prod_2', 3480, 'EUR', 'month', []);
+    $fake->archivePrice($gone);
+
+    $fake->plantPrice('price_orphan', 'prod_1', 3480, 'EUR', 'month',
+        ['addon' => 'priority_support'], created: 0);
+
+    $found = collect($fake->activePricesFor('prod_1'))->pluck('id')->all();
+
+    expect($found)->toContain($kept, 'price_orphan')
+        ->and($found)->not->toContain($gone, $other);
+});