diff --git a/src/app/pages/fastcheck-page/fastcheck-page.html b/src/app/pages/fastcheck-page/fastcheck-page.html
index daef220..7140bc7 100644
--- a/src/app/pages/fastcheck-page/fastcheck-page.html
+++ b/src/app/pages/fastcheck-page/fastcheck-page.html
@@ -91,16 +91,18 @@
         }
       </div>
 
-      <button class="pay-btn" type="button" (click)="pay()" [disabled]="!canPay()">
-        <span class="pay-btn__icon">
-          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-               stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
-            <rect x="1" y="4" width="22" height="16" rx="2" ry="2" />
-            <line x1="1" y1="10" x2="23" y2="10" />
-          </svg>
-        </span>
-        {{ 'fastcheck.pay_btn' | translate }}
-      </button>
+      @if (hasPartnerId()) {
+        <button class="pay-btn" type="button" (click)="pay()" [disabled]="!canPay()">
+          <span class="pay-btn__icon">
+            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor"
+                 stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
+              <rect x="1" y="4" width="22" height="16" rx="2" ry="2" />
+              <line x1="1" y1="10" x2="23" y2="10" />
+            </svg>
+          </span>
+          {{ 'fastcheck.pay_btn' | translate }}
+        </button>
+      }
     </div>
 
     <div class="card__footer">
diff --git a/src/app/pages/fastcheck-page/fastcheck-page.ts b/src/app/pages/fastcheck-page/fastcheck-page.ts
index d5e279f..f9d9404 100644
--- a/src/app/pages/fastcheck-page/fastcheck-page.ts
+++ b/src/app/pages/fastcheck-page/fastcheck-page.ts
@@ -74,6 +74,8 @@ export class FastcheckPage {
 
   // Pass-through partner id from ?id= used by the "New" button link.
   partnerId = signal<string>('');
+  // True only when a real ?id was present in the URL (not the default fallback).
+  hasPartnerId = signal<boolean>(false);
   newQrUrl = computed(() => {
     const id = this.partnerId() || this.defaultPartnerId;
     return `https://qr.vitanova.network/?id=${encodeURIComponent(id)}`;
@@ -145,7 +147,9 @@ export class FastcheckPage {
     const params = new URLSearchParams(window.location.search);
 
     // ?id=<partnerId> — used by the "New" button URL; fallback to default id.
-    this.partnerId.set(params.get('id') ?? this.defaultPartnerId);
+    const idParam = params.get('id');
+    this.partnerId.set(idParam ?? this.defaultPartnerId);
+    this.hasPartnerId.set(!!idParam);
 
     // ?iid=xxxxxx-xxxxxx-xxxxxx  — auto-fill and trigger lookup
     const iidParam = params.get('iid') ?? '';