Feat: Enforce strict payment logic

src/scenes/user/checkout.js

@@ -355,15 +355,32 @@ const checkoutScene = new Scenes.WizardScene(
         const total = cart.reduce((acc, item) => acc + (item.price * item.count), 0);
         ctx.wizard.state.total = total;
 
+        // BTS is strictly Card (handled via pre-set or just flow)
         if (ctx.wizard.state.deliveryMethod === i18n.delivery_bts) {
+            // BTS flow usually requires Card payment proof, so we treat it same as Card
+            // But existing code jumped to Step 9 directly? 
+            // Line 358 in original code: return ctx.wizard.selectStep(9);
+            // We keep that behavior or merge it. 
+            // Original: 358: if (ctx.wizard.state.deliveryMethod === i18n.delivery_bts) ... selectStep(9)
+            // Let's keep existing BTS logic if it was working, but here we are replacing the block.
+            // The original code handled BTS specifically at line 358.
+            // Let's replicate that logic first.
             ctx.reply(`📨 **BTS Pay**\n\n8600 ...`, navKeyboard(ctx, i18n));
             return ctx.wizard.selectStep(9);
         }
 
-        ctx.reply(i18n.payment_select, Markup.keyboard([
-            [i18n.payment_cash, i18n.payment_card],
-            [i18n.btn_back_nav, i18n.btn_cancel]
-        ]).resize().oneTime());
+        // Conditional Payment Buttons
+        let paymentButtons = [];
+        if (ctx.wizard.state.deliveryMethod === i18n.delivery_pickup) {
+            // Pickup -> Cash Only
+            paymentButtons.push([i18n.payment_cash]);
+        } else {
+            // Yandex (Delivery) -> Card Only
+            paymentButtons.push([i18n.payment_card]);
+        }
+        paymentButtons.push([i18n.btn_back_nav, i18n.btn_cancel]);
+
+        ctx.reply(i18n.payment_select, Markup.keyboard(paymentButtons).resize().oneTime());
         return ctx.wizard.next();
     },
     // Step 8: Payment Method
@@ -374,6 +391,15 @@ const checkoutScene = new Scenes.WizardScene(
         if (nav === 'BACK') return ctx.wizard.selectStep(7);
 
         const choice = ctx.message.text;
+
+        // Validation: Verify if choice is allowed for current delivery method
+        if (ctx.wizard.state.deliveryMethod === i18n.delivery_pickup && choice !== i18n.payment_cash) {
+            return ctx.reply("⚠️ Olib ketish uchun faqat Naqd to'lov mavjud.", Markup.keyboard([[i18n.payment_cash], [i18n.btn_back_nav, i18n.btn_cancel]]).resize());
+        }
+        if (ctx.wizard.state.deliveryMethod === i18n.delivery_yandex && choice !== i18n.payment_card) {
+            return ctx.reply("⚠️ Yetkazib berish uchun faqat Karta orqali to'lov mavjud.", Markup.keyboard([[i18n.payment_card], [i18n.btn_back_nav, i18n.btn_cancel]]).resize());
+        }
+
         if (choice === i18n.payment_cash) {
             ctx.wizard.state.paymentMethod = 'Naqd';
             return await finishOrder(ctx);