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/Middleware/RedirectLegacyQrToLadillLink.php

@@ -19,13 +19,20 @@ class RedirectLegacyQrToLadillLink
             return $next($request);
         }
 
-        // Same-origin AJAX from Mini-hosted payment pages (e.g. mini.ladill.com)
-        // must hit local /q/{code}/pay — redirecting to ladl.link breaks CORS and
-        // the checkout sheet never opens.
+        // Same-origin pay from Mini-hosted pages (e.g. mini.ladill.com) must hit
+        // local /q/{code}/pay — redirecting to ladl.link breaks CORS / form POSTs
+        // and used to dump the browser onto checkout.paystack.com.
         if ($request->ajax() || $request->expectsJson() || $request->wantsJson()) {
             return $next($request);
         }
 
+        // Form POST (and any method) to the Mini pay endpoint stays on Mini so
+        // PaymentController can return JSON or flash payload for in-page Inline.
+        $path = ltrim($request->path(), '/');
+        if (preg_match('#^q/[^/]+/pay(?:/callback)?$#i', $path) === 1) {
+            return $next($request);
+        }
+
         return LadillLink::legacyRedirect($request);
     }
 }