Fix POS Paystack double modal and keep checkout in-app.

Pass access_code into the payment sheet, launch Paystack Inline only,
and hide Ladill chrome after Inline loads so register Card/MoMo shows
a single payment interface.

app/Http/Controllers/Pos/RegisterController.php

@@ -235,6 +235,7 @@ class RegisterController extends Controller
 
             $result = $this->sales->initiatePayCheckout($sale, $merchant);
             $checkoutUrl = $result['checkout_url'] ?? null;
+            $accessCode = $result['access_code'] ?? null;
 
             $this->customerDisplays->pushPayment($location, $sale->fresh(['lines']), [
                 'checkout_url' => $checkoutUrl,
@@ -246,6 +247,7 @@ class RegisterController extends Controller
             if ($request->expectsJson() || $request->ajax()) {
                 return response()->json([
                     'checkout_url' => $checkoutUrl,
+                    'access_code' => $accessCode,
                     'sale_id' => $sale->id,
                 ]);
             }
@@ -253,6 +255,7 @@ class RegisterController extends Controller
             return redirect()
                 ->route('pos.sales.show', $sale)
                 ->with('checkout_url', $checkoutUrl)
+                ->with('access_code', $accessCode)
                 ->with('success', 'Payment sheet ready — customer screen shows the QR; till sheet is for the operator.');
         } catch (RuntimeException $e) {
             return back()->withInput()->with('error', $e->getMessage());

app/Http/Controllers/Pos/TicketController.php

@@ -230,6 +230,7 @@ class TicketController extends Controller
             if ($request->expectsJson() || $request->ajax()) {
                 return response()->json([
                     'checkout_url' => $result['checkout_url'],
+                    'access_code' => $result['access_code'] ?? '',
                     'sale_id' => $sale->id,
                 ]);
             }
@@ -237,6 +238,7 @@ class TicketController extends Controller
             return redirect()
                 ->route('pos.tickets.show', $sale)
                 ->with('checkout_url', $result['checkout_url'])
+                ->with('access_code', $result['access_code'] ?? '')
                 ->with('success', 'Payment sheet ready — hand the device to the customer for card or MoMo.');
         } catch (RuntimeException $e) {
             return back()->with('error', $e->getMessage());

app/Services/Payments/MerchantGatewayService.php

@@ -132,6 +132,7 @@ class MerchantGatewayService
 
         return [
             'checkout_url' => (string) $checkout['checkout_url'],
+            'access_code' => (string) ($checkout['access_code'] ?? ''),
             'reference' => (string) $checkout['reference'],
             'provider' => 'ladill_pay',
         ];
@@ -186,6 +187,7 @@ class MerchantGatewayService
 
         return [
             'checkout_url' => $url,
+            'access_code' => (string) ($response->json('data.access_code') ?? ''),
             'reference' => (string) ($response->json('data.reference') ?: $reference),
             'provider' => PaymentGatewaySetting::PROVIDER_PAYSTACK,
         ];

app/Services/Pos/PosSaleService.php

@@ -362,7 +362,11 @@ class PosSaleService
             'payment_reference' => $checkout['reference'],
         ])->save();
 
-        return ['payment' => $payment, 'checkout_url' => $checkout['checkout_url']];
+        return [
+            'payment' => $payment,
+            'checkout_url' => $checkout['checkout_url'],
+            'access_code' => (string) ($checkout['access_code'] ?? ''),
+        ];
     }
 
     public function completePayPayment(string $reference): PosPayment
@@ -577,6 +581,7 @@ class PosSaleService
         return [
             'sale' => $sale->fresh('lines'),
             'checkout_url' => $checkoutUrl,
+            'access_code' => (string) ($checkout['access_code'] ?? ''),
         ];
     }