Restore Paystack Inline in-page sheet/modal; stop separate-browser checkout.

Pass access_code through pay responses and launch PaystackPop from the shared sheet instead of window.open.

resources/views/public/qr/payment-landing.blade.php

@@ -139,6 +139,9 @@
                 errorMsg: config.errorMsg ?? '',
                 showSheet: false,
                 checkoutUrl: '',
+                accessCode: '',
+                publicKey: '',
+                returnUrl: '',
                 paymentSheetStyle: '',
                 sheetBleedStyle: '',
                 init() {
@@ -169,8 +172,10 @@
                     this.errorMsg = '';
                     this.loading = true;
                     this.checkoutUrl = '';
-                    // Open sheet chrome immediately so mobile bottom sheet / desktop
-                    // modal is visible before Paystack (popup opens from Continue).
+                    this.accessCode = '';
+                    this.publicKey = '';
+                    this.returnUrl = '';
+                    // Open sheet chrome immediately (mobile bottom sheet / desktop modal).
                     this.showSheet = true;
                     const controller = new AbortController();
                     const timer = setTimeout(() => controller.abort(), 45000);
@@ -195,7 +200,7 @@
                             this.errorMsg = apiError || ('Could not start payment (' + res.status + '). Please try again.');
                             return;
                         }
-                        if (!data.checkout_url) {
+                        if (!data.checkout_url && !data.access_code) {
                             this.showSheet = false;
                             this.errorMsg = 'Could not start payment. Please try again.';
                             return;
@@ -203,7 +208,10 @@
                         // Legacy MoMo waiting page must be full-page — never trap it in the Paystack iframe.
                         const useSheet = data.provider !== 'mtn_momo';
                         if (useSheet) {
-                            this.checkoutUrl = data.checkout_url;
+                            this.checkoutUrl = data.checkout_url || '';
+                            this.accessCode = data.access_code || '';
+                            this.publicKey = data.public_key || '';
+                            this.returnUrl = data.callback_url || '';
                         } else {
                             this.showSheet = false;
                             window.location.assign(data.checkout_url);