diff --git a/apps/web/src/app/core/api/game-api.models.ts b/apps/web/src/app/core/api/game-api.models.ts
index d7d1a6e..f05f567 100644
--- a/apps/web/src/app/core/api/game-api.models.ts
+++ b/apps/web/src/app/core/api/game-api.models.ts
@@ -446,13 +446,8 @@ export interface ShopOfferView {
   currencyType: string;
   price: number;
   quantity: number;
-  /**
-   * Optional so fixtures written before slice 0.8.5 (e.g. the trade-in store's
-   * own spec, out of this task's scope) keep compiling untouched. The server
-   * always sends both fields; the template treats a missing one as "none".
-   */
-  effectSummary?: string | null;
-  requirements?: ShopOfferRequirement[];
+  effectSummary: string | null;
+  requirements: ShopOfferRequirement[];
   unlocked: boolean;
   affordable: boolean;
 }
diff --git a/apps/web/src/app/features/npc/merchant-page.component.html b/apps/web/src/app/features/npc/merchant-page.component.html
index 6da1ea0..9850ecd 100644
--- a/apps/web/src/app/features/npc/merchant-page.component.html
+++ b/apps/web/src/app/features/npc/merchant-page.component.html
@@ -228,7 +228,7 @@
                   }}</span>
                 }
                 @for (
-                  requirement of offer.requirements ?? [];
+                  requirement of offer.requirements;
                   track requirement.label
                 ) {
                   <span
diff --git a/apps/web/src/app/features/npc/merchant.store.spec.ts b/apps/web/src/app/features/npc/merchant.store.spec.ts
index f8e4b8e..09fa08d 100644
--- a/apps/web/src/app/features/npc/merchant.store.spec.ts
+++ b/apps/web/src/app/features/npc/merchant.store.spec.ts
@@ -89,6 +89,8 @@ function shopView(): ShopView {
         currencyType: 'SILVER',
         price: 12,
         quantity: 1,
+        effectSummary: null,
+        requirements: [],
         unlocked: true,
         affordable: true,
       },