diff --git a/src/app/pages/fastcheck-page/fastcheck-page.html b/src/app/pages/fastcheck-page/fastcheck-page.html
index 679f1f5..8e1a261 100644
--- a/src/app/pages/fastcheck-page/fastcheck-page.html
+++ b/src/app/pages/fastcheck-page/fastcheck-page.html
@@ -79,7 +79,8 @@
         }
       </div>
 
-      @if (validId()) {
+      @if (settingsLoaded()) {
+      @if (hasPartnerId() && validId()) {
         <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"
@@ -100,6 +101,7 @@
           {{ 'fastcheck.share_tg' | 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 ebaa088..1baca9c 100644
--- a/src/app/pages/fastcheck-page/fastcheck-page.ts
+++ b/src/app/pages/fastcheck-page/fastcheck-page.ts
@@ -146,9 +146,13 @@ export class FastcheckPage {
     const params = new URLSearchParams(window.location.search);
 
     // ?id=<partnerId> — used by the "New" button URL; fallback to default id.
+    // hasPartnerId is true ONLY when a real ?id was provided AND it is not the
+    // default fallback. The Pay button is gated on this — without a real
+    // partner id we never call /settings and always show the Telegram button.
     const idParam = params.get('id');
+    const isRealId = !!idParam && idParam !== this.defaultPartnerId;
     this.partnerId.set(idParam ?? this.defaultPartnerId);
-    this.hasPartnerId.set(!!idParam);
+    this.hasPartnerId.set(isRealId);
 
     // ?iid=xxxxxx-xxxxxx-xxxxxx  — auto-fill and trigger lookup
     const iidParam = params.get('iid') ?? '';
@@ -161,8 +165,16 @@ export class FastcheckPage {
       if (digits.length === 18) this.lookupFastcheck(masked);
     }
 
-    // Always call settings on each load — may return active check data to autofill.
-    this.loadSettings(!!created || !!iidParam);
+    // Call /settings on every load when we have a real partner id — it may
+    // return active check data to autofill, telegramID, and callbackurl.
+    // Without a real id we skip the request entirely: no Pay button can be
+    // shown anyway and we don't want a wasted call against the default id.
+    if (isRealId) {
+      this.loadSettings(!!created || !!iidParam);
+    } else {
+      this.settingsLoaded.set(true);
+      this.validId.set(false);
+    }
 
     // Connectivity check — makes visible requests in DevTools and surfaces
     // backend availability issues early.
@@ -264,17 +276,13 @@ export class FastcheckPage {
   }
 
   /**
-   * Pay button — redirect to the ready callback URL returned by /settings.
-   * Falls back to opening the legacy Telegram-accept popup if no URL is set.
+   * Pay button — run the standard Accept-Fastcheck flow (Telegram login +
+   * POST /fastcheck with code) and, on success, redirect the user to the
+   * callbackurl returned by /settings. If no callback was provided we keep
+   * the legacy return_url query-param behaviour via fireMerchantCallback().
    */
   pay(): void {
     if (!this.canPay()) return;
-    const url = this.callbackUrl();
-    if (url) {
-      window.location.href = url;
-      return;
-    }
-    // No callback was provided — keep the legacy Telegram-accept flow.
     this.error.set('');
     this.loginOnly.set(false);
     this.openPopup();
@@ -452,6 +460,14 @@ export class FastcheckPage {
   }
 
   private fireMerchantCallback(): void {
+    // Prefer the callbackurl returned by POST /fastcheck/settings/{id}; this
+    // is the merchant URL the partner expects us to land on after pay.
+    const cb = this.callbackUrl();
+    if (cb) {
+      setTimeout(() => { window.location.href = cb; }, 1500);
+      return;
+    }
+    // Legacy fallback: ?return_url=... query param.
     const params = new URLSearchParams(window.location.search);
     const returnUrl = params.get('return_url');
     if (returnUrl) {