diff --git a/packages/stage-ui/src/composables/use-subscription.ts b/packages/stage-ui/src/composables/use-subscription.ts
index f04a7c5a1a..446e63d55e 100644
--- a/packages/stage-ui/src/composables/use-subscription.ts
+++ b/packages/stage-ui/src/composables/use-subscription.ts
@@ -351,7 +351,7 @@ export function useSubscription(options: {
         throw new Error(t('settings.pages.capacitor.checkout.error'))
 
       // NOTICE:
-      // `productChangeInfo` makes the checkout replace the subscription instead of adding a second one.
+      // `productChangeInfo` requests a change. Without a configured path, the SDK creates a new subscription.
       // The SDK marks the field internal while product changes are in beta, so its type omits it.
       // https://www.revenuecat.com/docs/web/product-changes
       // Remove this local type when `PurchaseParams` declares `productChangeInfo`.
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d3dbefc189..0536f5faeb 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -409,7 +409,7 @@ catalogs:
       specifier: ^0.1.7
       version: 0.1.7
     '@revenuecat/purchases-js':
-      specifier: ^1.70.0
+      specifier: 1.70.0
       version: 1.70.0
     '@rive-app/canvas-lite':
       specifier: ^2.40.1
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index fdb8ccdf66..5a8275eca0 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -184,7 +184,7 @@ catalog:
   '@proj-airi/unocss-preset-chromatic': ^1.1.4
   '@proj-airi/unplugin-fetch': ^0.2.3
   '@proj-airi/unplugin-live2d-sdk': ^0.1.7
-  '@revenuecat/purchases-js': ^1.70.0
+  '@revenuecat/purchases-js': 1.70.0
   '@rive-app/canvas-lite': ^2.40.1
   '@sherpaw/asr': 0.3.0
   '@sherpaw/kws': 0.3.0
diff --git a/server/apps/api/src/services/adapters/revenuecat-subscriber.test.ts b/server/apps/api/src/services/adapters/revenuecat-subscriber.test.ts
index 8e5a2f85fc..7de84724e7 100644
--- a/server/apps/api/src/services/adapters/revenuecat-subscriber.test.ts
+++ b/server/apps/api/src/services/adapters/revenuecat-subscriber.test.ts
@@ -162,6 +162,39 @@ describe('revenuecat subscriber client', () => {
       expect((await customer(renewed))[0]!.pendingChange).toBeNull()
     })
 
+    // https://github.com/moeru-ai/airi/pull/3003#discussion_r4302328417
+    // ROOT CAUSE:
+    // RevenueCat omits unchanged products from pending_changes.
+    // Requiring product rejected early and failed renewals with 502.
+    // The nested product is now optional and still accepts null.
+    it.each([
+      {
+        scenario: 'early renewal',
+        autoRenewalStatus: 'has_already_renewed',
+        pendingChanges: { current_period_starts_at: periodEnd, current_period_ends_at: Date.parse('2026-12-01T00:00:00Z') },
+      },
+      {
+        scenario: 'failed upcoming renewal',
+        autoRenewalStatus: 'will_renew',
+        pendingChanges: { status: 'in_billing_retry', pending_payment: true, gives_access: false },
+      },
+    ])('accepts $scenario without a pending product (Issue #3003)', async ({ autoRenewalStatus, pendingChanges }) => {
+      const { client } = revenuecat({
+        subscriptions: [{ ...goSubscription, auto_renewal_status: autoRenewalStatus, pending_changes: pendingChanges }],
+        activeEntitlements: [{ entitlement_id: 'entl_go', expires_at: periodEnd }],
+      })
+
+      expect(await client.fetchEntitlements('user-1')).toEqual([{
+        entitlementId: 'airi_go',
+        productId: 'rc_go_monthly',
+        purchasedAt: new Date(periodStart),
+        accessUntil: new Date(periodEnd),
+        pendingChange: null,
+      }])
+      expect(await client.hasRenewingSubscription('user-1')).toBe(true)
+      expect(await client.grantProductChange('user-1')).toEqual({ subscriptionId: 'sub_go', subscriberToken: 'subscriber-token' })
+    })
+
     // ROOT CAUSE:
     //
     // The server granted subscriptions of both environments.
diff --git a/server/apps/api/src/services/adapters/revenuecat-subscriber.ts b/server/apps/api/src/services/adapters/revenuecat-subscriber.ts
index 0c1a463a0c..1ae5d0e23b 100644
--- a/server/apps/api/src/services/adapters/revenuecat-subscriber.ts
+++ b/server/apps/api/src/services/adapters/revenuecat-subscriber.ts
@@ -33,10 +33,10 @@ const subscriptionSchema = object({
   current_period_ends_at: nullable(number()),
   /**
    * The state at the next renewal. `product` differs from `product_id` when a downgrade is scheduled.
-   * It also appears with the same product after an early renewal, or before a failed renewal.
+   * Early renewals and failed upcoming renewals can omit `product` when it stays the same.
    */
   pending_changes: optional(nullable(object({
-    product: nullable(object({ id: string() })),
+    product: optional(nullable(object({ id: string() }))),
   }))),
   entitlements: object({
     items: array(object({ id: string(), lookup_key: string() })),
diff --git a/server/docs/ai/adr/2026-10-04-subscription-credits.md b/server/docs/ai/adr/2026-10-04-subscription-credits.md
index 1d306bf53b..c0d0638a4e 100644
--- a/server/docs/ai/adr/2026-10-04-subscription-credits.md
+++ b/server/docs/ai/adr/2026-10-04-subscription-credits.md
@@ -141,9 +141,10 @@ Purchased Flux capacity and `GET /flux/history` read only the wallet pool.
 
 ### Product change
 
-The Web SDK replaces a web subscription with another Capacitor through `purchase({ rcPackage, productChangeInfo })`.
+The Web SDK requests a subscription change through `purchase({ rcPackage, productChangeInfo })`.
 See the [RevenueCat Web SDK product changes](https://www.revenuecat.com/docs/web/product-changes).
 The SDK marks `productChangeInfo` internal during the beta, so the client declares the field locally with a `NOTICE`.
+The workspace pins the SDK to `1.70.0` because internal fields have no semver guarantee.
 
 `POST /api/v1/revenuecat/product-change` gives the signed-in user a `subscriptionId` and a `subscriberToken`.
 The server picks the latest subscription with access that `rc_billing` or `stripe` bills.
@@ -155,6 +156,8 @@ The route allows 10 calls for each user in one minute.
 
 RevenueCat starts an upgrade at once and charges the prorated difference. It starts a downgrade at the next renewal.
 The dashboard defines the allowed changes under **Product Catalog > Products > Subscription changes**.
+Without a configured path, the SDK opens a regular purchase and can create a second subscription.
+The client does not check these paths before checkout. PR #3003 remains a draft until this duplicate-charge risk is resolved.
 An upgrade sends `PRODUCT_CHANGE` and `RENEWAL`. The webhook then reconciles the new period and quota.
 The client reports a downgrade as scheduled with the renewal date.
 `POST /api/v1/revenuecat/sync` returns `pendingChange` from `pending_changes.product` of the subscription.