Keep Mini QR Paystack checkout fully in-app.

Stop form POSTs from 307ing to ladl.link or redirecting away to
checkout.paystack.com, open Paystack Inline with access_code, and use
the single-chrome sheet so payment stays on the Mini page.

app/Http/Controllers/Public/PaymentController.php

@@ -41,7 +41,7 @@ class PaymentController extends Controller
             return back()->withInput()->with('error', $e->getMessage());
         }
 
-        if ($request->expectsJson()) {
+        if ($request->expectsJson() || $request->ajax()) {
             return response()->json([
                 'checkout_url' => $result['checkout_url'],
                 'access_code' => $result['access_code'] ?? null,
@@ -52,7 +52,24 @@ class PaymentController extends Controller
             ]);
         }
 
-        return redirect()->away($result['checkout_url']);
+        // Never send the browser to checkout.paystack.com — reopen the landing
+        // with checkout payload so Paystack Inline can run in-page.
+        $provider = (string) ($result['provider'] ?? '');
+        if ($provider === 'mtn_momo') {
+            $waiting = (string) ($result['checkout_url'] ?? '');
+            if ($waiting !== '' && str_starts_with($waiting, url('/'))) {
+                return redirect()->to($waiting);
+            }
+        }
+
+        return redirect()
+            ->to(url('/q/'.$shortCode))
+            ->with('checkout_url', $result['checkout_url'] ?? null)
+            ->with('access_code', $result['access_code'] ?? null)
+            ->with('public_key', $result['public_key'] ?? null)
+            ->with('callback_url', $result['callback_url'] ?? null)
+            ->with('provider', $provider !== '' ? $provider : 'paystack')
+            ->with('amount', $validated['amount']);
     }
 
     public function callback(Request $request, string $shortCode): View