diff --git a/src/common/utils/money.utils.ts b/src/common/utils/money.utils.ts
new file mode 100644
index 0000000..32b32fb
--- /dev/null
+++ b/src/common/utils/money.utils.ts
@@ -0,0 +1,17 @@
+/**
+ * Round monetary amounts to whole currency units (DB stores scale 0).
+ */
+export function roundMoney(value: number | string | null | undefined): number {
+  const numeric = Number(value);
+  if (!Number.isFinite(numeric)) {
+    return 0;
+  }
+  return Math.round(numeric);
+}
+
+/**
+ * Format monetary amounts for display/SMS without floating-point artifacts.
+ */
+export function formatMoneyAmount(value: number | string | null | undefined): string {
+  return roundMoney(value).toString();
+}
diff --git a/src/modules/cart/controllers/cart.controller.ts b/src/modules/cart/controllers/cart.controller.ts
index b8afc3f..28fb61f 100644
--- a/src/modules/cart/controllers/cart.controller.ts
+++ b/src/modules/cart/controllers/cart.controller.ts
@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Body, Patch, Delete, UseGuards, Param } from '@nestjs/common';
+import { Controller, Get, Post, Body, Patch, Delete, UseGuards, Param, ValidationPipe } from '@nestjs/common';
 import { CartService } from '../providers/cart.service';
 import { BulkAddItemsToCartDto } from '../dto/bulk-add-items.dto';
 import { ApplyCouponDto } from '../dto/apply-coupon.dto';
@@ -38,12 +38,12 @@ export class CartController {
   }
 
   @Post('variant/bulk')
-  @ApiOperation({ summary: 'Bulk add items to cart (increments quantity if items exist)' })
+  @ApiOperation({ summary: 'Bulk set item quantities in cart (replaces quantity if item exists)' })
   @ApiHeader(API_HEADER_SLUG)
   bulkAddItems(
     @UserId() userId: string,
     @ShopId() shopId: string,
-    @Body() bulkAddItemsDto: BulkAddItemsToCartDto,
+    @Body(new ValidationPipe({ transform: true, whitelist: true })) bulkAddItemsDto: BulkAddItemsToCartDto,
   ) {
     return this.cartService.bulkAddItems(userId, shopId, bulkAddItemsDto);
   }
diff --git a/src/modules/cart/providers/cart-calculation.service.ts b/src/modules/cart/providers/cart-calculation.service.ts
index b211d5a..9d1c885 100644
--- a/src/modules/cart/providers/cart-calculation.service.ts
+++ b/src/modules/cart/providers/cart-calculation.service.ts
@@ -8,6 +8,8 @@ import { Product } from '../../products/entities/product.entity';
 import { Cart } from '../interfaces/cart.interface';
 import { CouponService } from 'src/modules/coupons/providers/coupon.service';
 import { GeographicUtils } from '../utils/geographic.utils';
+import { roundQuantity } from 'src/modules/products/utils/quantity.utils';
+import { roundMoney } from 'src/common/utils/money.utils';
 
 @Injectable()
 export class CartCalculationService {
@@ -24,7 +26,7 @@ export class CartCalculationService {
     const safeUnitDiscount = Math.min(Number(unitDiscount) || 0, safeUnitPrice);
     const itemTotalPrice = safeUnitPrice * quantity;
     const itemTotalDiscount = safeUnitDiscount * quantity;
-    return itemTotalPrice - itemTotalDiscount;
+    return roundMoney(itemTotalPrice - itemTotalDiscount);
   }
 
   /**
@@ -36,17 +38,23 @@ export class CartCalculationService {
     let totalItems = 0;
 
     for (const item of cart.items) {
+      const quantity = roundQuantity(item.quantity);
       const unitPrice = Number(item.price) || 0;
       const unitDiscount = Math.min(Number(item.discount) || 0, unitPrice);
-      const itemPrice = unitPrice * item.quantity;
-      const itemDiscount = unitDiscount * item.quantity;
+      const itemPrice = unitPrice * quantity;
+      const itemDiscount = unitDiscount * quantity;
       subTotal += itemPrice;
       itemsDiscount += itemDiscount;
-      totalItems += item.quantity;
-      item.totalPrice = itemPrice - itemDiscount;
+      totalItems += quantity;
+      item.quantity = quantity;
+      item.totalPrice = roundMoney(itemPrice - itemDiscount);
     }
 
-    return { subTotal, itemsDiscount, totalItems };
+    return {
+      subTotal: roundMoney(subTotal),
+      itemsDiscount: roundMoney(itemsDiscount),
+      totalItems,
+    };
   }
 
   /**
@@ -94,10 +102,10 @@ export class CartCalculationService {
       if (cart.coupon.maxDiscount && discount > cart.coupon.maxDiscount) {
         discount = cart.coupon.maxDiscount;
       }
-      return discount;
+      return roundMoney(discount);
     }
 
-    return Math.min(cart.coupon.value, priceAfterItemDiscount);
+    return roundMoney(Math.min(cart.coupon.value, priceAfterItemDiscount));
   }
 
   /**
@@ -107,7 +115,7 @@ export class CartCalculationService {
     const shop = await this.em.findOne(Shop, { id: shopId });
     const vat = shop?.vat ? Number(shop.vat) : 0;
     if (!vat || vat <= 0) return 0;
-    return (Math.max(0, amountAfterDiscounts) * vat) / 100;
+    return roundMoney((Math.max(0, amountAfterDiscounts) * vat) / 100);
   }
 
   /**
@@ -122,7 +130,7 @@ export class CartCalculationService {
 
     // If not distance based, return fixed delivery fee
     if (deliveryMethod.deliveryFeeType !== DeliveryFeeTypeEnum.DISTANCE_BASED) {
-      return Number(deliveryMethod.deliveryFee) || 0;
+      return roundMoney(Number(deliveryMethod.deliveryFee) || 0);
     }
 
     // For distance based calculation we need shop and user coordinates
@@ -131,11 +139,11 @@ export class CartCalculationService {
 
     if (!shop || shop.latitude == null || shop.longitude == null) {
       // fallback to configured fixed fee when coordinates are missing
-      return Number(deliveryMethod.deliveryFee) || 0;
+      return roundMoney(Number(deliveryMethod.deliveryFee) || 0);
     }
 
     if (!userAddr || userAddr.latitude == null || userAddr.longitude == null) {
-      return Number(deliveryMethod.deliveryFee) || 0;
+      return roundMoney(Number(deliveryMethod.deliveryFee) || 0);
     }
 
     const restLat = Number(shop.latitude);
@@ -158,7 +166,7 @@ export class CartCalculationService {
 
     if (minFee > 0 && fee < minFee) fee = minFee;
 
-    return Math.max(0, Number(fee));
+    return roundMoney(Math.max(0, Number(fee)));
   }
 
   /**
@@ -171,13 +179,13 @@ export class CartCalculationService {
 
     const couponDiscount = await this.calculateCouponDiscount(cart, subTotal, itemsDiscount);
     cart.couponDiscount = couponDiscount;
-    cart.totalDiscount = couponDiscount + itemsDiscount;
+    cart.totalDiscount = roundMoney(couponDiscount + itemsDiscount);
 
     cart.tax = await this.calculateTax(cart.shopId, Math.max(0, subTotal - cart.totalDiscount));
     cart.deliveryFee = await this.calculateDeliveryFee(cart);
 
     // total = subtotal – totalDiscount + tax + deliveryFee
-    cart.total = Math.max(0, subTotal - cart.totalDiscount) + cart.tax + cart.deliveryFee;
+    cart.total = roundMoney(Math.max(0, subTotal - cart.totalDiscount) + cart.tax + cart.deliveryFee);
     cart.totalItems = totalItems;
     cart.updatedAt = this.nowIso();
   }
diff --git a/src/modules/cart/providers/cart-item.service.ts b/src/modules/cart/providers/cart-item.service.ts
index f23b60b..e12c66c 100644
--- a/src/modules/cart/providers/cart-item.service.ts
+++ b/src/modules/cart/providers/cart-item.service.ts
@@ -69,28 +69,54 @@ export class CartItemService {
    * Add or increment item in cart (validates stock against existing + new quantity)
    */
   async addOrIncrementItem(cart: Cart, variantId: string, shopId: string, quantityToAdd: number): Promise<void> {
+    const normalizedQuantityToAdd = roundQuantity(quantityToAdd);
     const index = this.getItemIndex(cart, variantId);
-    const existingQuantityInCart = index >= 0 ? cart.items[index].quantity : 0;
+    const existingQuantityInCart = index >= 0 ? roundQuantity(cart.items[index].quantity) : 0;
 
     const variant = await this.validationService.validateAndGetVariant(
       variantId,
       shopId,
-      quantityToAdd,
+      normalizedQuantityToAdd,
       existingQuantityInCart,
       cart,
     );
 
     if (index < 0) {
-      cart.items.push(this.createCartItem(variant, quantityToAdd));
+      cart.items.push(this.createCartItem(variant, normalizedQuantityToAdd));
       return;
     }
 
     const existingItem = cart.items[index];
-    const newQuantity = roundQuantity(existingItem.quantity + quantityToAdd);
+    const newQuantity = roundQuantity(existingQuantityInCart + normalizedQuantityToAdd);
 
     cart.items[index] = this.buildCartItemFromFood(variant, newQuantity, existingItem);
   }
 
+  /**
+   * Set item quantity in cart (adds item if it does not exist)
+   */
+  async setItemQuantity(cart: Cart, variantId: string, shopId: string, quantity: number): Promise<void> {
+    const normalizedQuantity = roundQuantity(quantity);
+    const index = this.getItemIndex(cart, variantId);
+    const existingQuantityInCart = index >= 0 ? roundQuantity(cart.items[index].quantity) : 0;
+
+    const variant = await this.validationService.validateAndGetVariant(
+      variantId,
+      shopId,
+      normalizedQuantity,
+      existingQuantityInCart,
+      cart,
+      { mode: 'set' },
+    );
+
+    if (index < 0) {
+      cart.items.push(this.createCartItem(variant, normalizedQuantity));
+      return;
+    }
+
+    cart.items[index] = this.buildCartItemFromFood(variant, normalizedQuantity, cart.items[index]);
+  }
+
   /**
    * Increment item by product purchase step (1 for fixed, purchasePitch for variable)
    */
@@ -123,7 +149,7 @@ export class CartItemService {
     const existingItem = cart.items[itemIndex];
     const variant = await this.productService.findOrFailVariant(variantId);
     const step = getQuantityStep(variant.product);
-    const newQuantity = roundQuantity(existingItem.quantity - step);
+    const newQuantity = roundQuantity(roundQuantity(existingItem.quantity) - step);
 
     if (newQuantity <= 0) {
       cart.items.splice(itemIndex, 1);
diff --git a/src/modules/cart/providers/cart-validation.service.ts b/src/modules/cart/providers/cart-validation.service.ts
index 8d7874f..191f1cf 100644
--- a/src/modules/cart/providers/cart-validation.service.ts
+++ b/src/modules/cart/providers/cart-validation.service.ts
@@ -37,34 +37,42 @@ export class CartValidationService {
   async validateAndGetVariant(
     variantId: string,
     shopId: string,
-    quantityToAdd: number,
+    quantity: number,
     existingQuantityInCart: number = 0,
     cart?: { items: { variantId: string; quantity: number }[] },
+    options?: { mode?: 'increment' | 'set' },
   ): Promise<Variant> {
+    const mode = options?.mode ?? 'increment';
+    const normalizedQuantity = roundQuantity(quantity);
+    const normalizedExistingQuantity = roundQuantity(existingQuantityInCart);
     const variant = await this.productService.findOrFailVariant(variantId);
 
     if (variant.product.shop.id !== shopId) {
       throw new BadRequestException(CartMessage.PRODUCT_NOT_BELONGS_TO_SHOP);
     }
 
+    const totalRequested =
+      mode === 'set' ? normalizedQuantity : normalizedExistingQuantity + normalizedQuantity;
+
     if (variant.stock != null) {
-      const totalRequested = existingQuantityInCart + quantityToAdd;
-      if (totalRequested > variant.stock) {
+      if (totalRequested > roundQuantity(variant.stock)) {
         throw new BadRequestException(CartMessage.INSUFFICIENT_STOCK);
       }
     }
 
-    this.assertValidQuantity(variant, existingQuantityInCart + quantityToAdd);
+    this.assertValidQuantity(variant, totalRequested);
 
     const maxPurchase = variant.product.maxPurchaseQuantity;
     if (maxPurchase != null && maxPurchase > 0) {
       const productVariantIds = variant.product.variants.getItems().map((v) => v.id);
       const totalProductQuantityInCart =
         cart?.items?.reduce(
-          (sum, item) => (productVariantIds.includes(item.variantId) ? sum + item.quantity : sum),
+          (sum, item) =>
+            productVariantIds.includes(item.variantId) ? sum + roundQuantity(item.quantity) : sum,
           0,
         ) ?? 0;
-      const newTotalProductQuantity = totalProductQuantityInCart - existingQuantityInCart + quantityToAdd;
+      const newTotalProductQuantity =
+        totalProductQuantityInCart - normalizedExistingQuantity + totalRequested;
       if (newTotalProductQuantity > maxPurchase) {
         throw new BadRequestException(CartMessage.MAX_PURCHASE_EXCEEDED);
       }
diff --git a/src/modules/cart/providers/cart.service.ts b/src/modules/cart/providers/cart.service.ts
index 2fd6018..189c937 100644
--- a/src/modules/cart/providers/cart.service.ts
+++ b/src/modules/cart/providers/cart.service.ts
@@ -181,13 +181,13 @@ export class CartService {
   }
 
   /**
-   * Bulk add items to cart (increments quantity if items exist)
+   * Bulk set item quantities in cart (replaces quantity if item exists)
    */
   async bulkAddItems(userId: string, shopId: string, bulkAddItemsDto: BulkAddItemsToCartDto): Promise<Cart> {
     const cart = await this.getOrCreateCart(userId, shopId);
 
     for (const addItemDto of bulkAddItemsDto.items) {
-      await this.itemService.addOrIncrementItem(cart, addItemDto.variantId, shopId, addItemDto.quantity);
+      await this.itemService.setItemQuantity(cart, addItemDto.variantId, shopId, addItemDto.quantity);
     }
 
     return this.recalculateAndSaveCart(cart);
diff --git a/src/modules/cart/repositories/cart.repository.ts b/src/modules/cart/repositories/cart.repository.ts
index b5e714a..30dce2a 100644
--- a/src/modules/cart/repositories/cart.repository.ts
+++ b/src/modules/cart/repositories/cart.repository.ts
@@ -1,5 +1,6 @@
 import { Injectable } from '@nestjs/common';
 import { CacheService } from 'src/modules/utils/cache.service';
+import { roundQuantity } from 'src/modules/products/utils/quantity.utils';
 import { Cart } from '../interfaces/cart.interface';
 
 @Injectable()
@@ -20,7 +21,7 @@ export class CartRepository {
       try {
         const parsed: unknown = JSON.parse(cachedCart);
         if (this.isCart(parsed) && parsed.userId === userId && parsed.shopId === shopId) {
-          return parsed;
+          return this.normalizeCartQuantities(parsed);
         }
       } catch {
         // If parsing fails, return null
@@ -53,6 +54,17 @@ export class CartRepository {
     return `${this.CART_KEY_PREFIX}:${userId}:${shopId}`;
   }
 
+  /**
+   * Coerce cached item quantities to numbers (guards against string concat bugs).
+   */
+  private normalizeCartQuantities(cart: Cart): Cart {
+    for (const item of cart.items) {
+      item.quantity = roundQuantity(item.quantity);
+    }
+    cart.totalItems = roundQuantity(cart.totalItems);
+    return cart;
+  }
+
   /**
    * Type guard to check if an object is a Cart
    */
diff --git a/src/modules/orders/listeners/order.listeners.ts b/src/modules/orders/listeners/order.listeners.ts
index 6e39fc8..d7f0abf 100644
--- a/src/modules/orders/listeners/order.listeners.ts
+++ b/src/modules/orders/listeners/order.listeners.ts
@@ -11,6 +11,7 @@ import { OrderStatus } from '../interface/order.interface';
 import { PaymentMethodEnum } from 'src/modules/payments/interface/payment';
 import { UserService } from 'src/modules/users/providers/user.service';
 import { WalletTransactionReason, WalletTransactionType } from 'src/modules/users/interface/wallet';
+import { formatMoneyAmount } from 'src/common/utils/money.utils';
 
 @Injectable()
 export class OrderListeners {
@@ -69,17 +70,17 @@ export class OrderListeners {
         shopId: event.shopId,
         message: {
           title: NotifTitleEnum.ORDER_CREATED,
-          content: `سفارش شماره ${event.orderNumber} با مبلغ ${event.total} تومان با موفقیت ایجاد شد`,
+          content: `سفارش شماره ${event.orderNumber} با مبلغ ${formatMoneyAmount(event.total)} تومان با موفقیت ایجاد شد`,
           sms: {
             templateId: this.orderCreatedSmsTemplateId,
             parameters: {
               orderNumber: event.orderNumber,
-              total: event.total.toString(),
+              total: formatMoneyAmount(event.total),
             },
           },
           pushNotif: {
             title: `سفارش جدید`,
-            content: `سفارش شماره ${event.orderNumber} با مبلغ ${event.total} تومان با موفقیت ایجاد شد`,
+            content: `سفارش شماره ${event.orderNumber} با مبلغ ${formatMoneyAmount(event.total)} تومان با موفقیت ایجاد شد`,
             icon: `/`,
             action: {
               type: NotifTitleEnum.ORDER_CREATED,
diff --git a/src/modules/orders/providers/orders.service.ts b/src/modules/orders/providers/orders.service.ts
index 003979d..f35bbb1 100644
--- a/src/modules/orders/providers/orders.service.ts
+++ b/src/modules/orders/providers/orders.service.ts
@@ -27,6 +27,7 @@ import { OrderItemStatus } from '../enum/order-item.enum';
 import { getMinQuantity, isValidProductQuantity, roundQuantity } from '../../products/utils/quantity.utils';
 import { CouponService } from 'src/modules/coupons/providers/coupon.service';
 import { CouponType } from 'src/modules/coupons/interface/coupon';
+import { roundMoney } from 'src/common/utils/money.utils';
 
 type OrderItemData = { variant: Variant; quantity: number; unitPrice: number; discount: number };
 
@@ -101,7 +102,7 @@ export class OrdersService {
       for (const itemData of validated.orderItemsData) {
         const { variant, quantity, unitPrice, discount } = itemData;
 
-        const totalPrice = (unitPrice - discount) * quantity;
+        const totalPrice = roundMoney((unitPrice - discount) * quantity);
 
         const orderItem = em.create(OrderItem, {
           order,
@@ -127,7 +128,7 @@ export class OrdersService {
 
     this.eventEmitter.emit(
       OrderCreatedEvent.name,
-      new OrderCreatedEvent(order.id, shopId, String(order.orderNumber), order.total),
+      new OrderCreatedEvent(order.id, shopId, String(order.orderNumber), roundMoney(order.total)),
     );
 
     return { order };
@@ -212,6 +213,7 @@ export class OrdersService {
           'payments',
           'items',
           'items.variant',
+          'items.variant.product',
         ],
       },
     );
@@ -335,19 +337,19 @@ export class OrdersService {
       subTotal += unitPrice * item.quantity;
       itemsDiscount += unitDiscount * item.quantity;
       totalItems += item.quantity;
-      item.totalPrice = (unitPrice - unitDiscount) * item.quantity;
+      item.totalPrice = roundMoney((unitPrice - unitDiscount) * item.quantity);
     }
 
-    order.subTotal = subTotal;
-    order.itemsDiscount = itemsDiscount;
+    order.subTotal = roundMoney(subTotal);
+    order.itemsDiscount = roundMoney(itemsDiscount);
     order.totalItems = totalItems;
     order.couponDiscount = await this.calculateOrderCouponDiscount(order);
-    order.totalDiscount = order.couponDiscount + order.itemsDiscount;
+    order.totalDiscount = roundMoney(order.couponDiscount + order.itemsDiscount);
 
-    const amountAfterDiscounts = Math.max(0, subTotal - order.totalDiscount);
+    const amountAfterDiscounts = Math.max(0, order.subTotal - order.totalDiscount);
     const vat = order.shop?.vat ? Number(order.shop.vat) : 0;
-    order.tax = vat > 0 ? (amountAfterDiscounts * vat) / 100 : 0;
-    order.total = amountAfterDiscounts + order.tax + Number(order.deliveryFee || 0);
+    order.tax = vat > 0 ? roundMoney((amountAfterDiscounts * vat) / 100) : 0;
+    order.total = roundMoney(amountAfterDiscounts + order.tax + Number(order.deliveryFee || 0));
   }
 
   private async calculateOrderCouponDiscount(order: Order): Promise<number> {
@@ -395,10 +397,10 @@ export class OrdersService {
       if (couponDetail.maxDiscount && discount > couponDetail.maxDiscount) {
         discount = couponDetail.maxDiscount;
       }
-      return discount;
+      return roundMoney(discount);
     }
 
-    return Math.min(couponDetail.value, priceAfterItemDiscount);
+    return roundMoney(Math.min(couponDetail.value, priceAfterItemDiscount));
   }
 
   private assertStatusTransitionAllowed(order: Order, to: OrderStatus, ref: StatusTransitionRef) {
diff --git a/src/modules/payments/listeners/payment.listeners.ts b/src/modules/payments/listeners/payment.listeners.ts
index 9e9c9e0..2d17b73 100644
--- a/src/modules/payments/listeners/payment.listeners.ts
+++ b/src/modules/payments/listeners/payment.listeners.ts
@@ -7,6 +7,7 @@ import { NotifTitleEnum } from 'src/modules/notifications/interfaces/notificatio
 import { NotificationService } from 'src/modules/notifications/services/notification.service';
 import { ConfigService } from '@nestjs/config';
 import { OrdersService } from 'src/modules/orders/providers/orders.service';
+import { formatMoneyAmount } from 'src/common/utils/money.utils';
 
 @Injectable()
 export class PaymentListeners {
@@ -48,7 +49,7 @@ export class PaymentListeners {
         shopId: event.shopId,
         message: {
           title: NotifTitleEnum.PAYMENT_SUCCESS,
-          content: `پرداخت سفارش شماره ${event.orderNumber} با روش ${this.getPaymentMethodFarsi(event.paymentMethod)} و مبلغ ${event.total} تومان با موفقیت انجام شد`,
+          content: `پرداخت سفارش شماره ${event.orderNumber} با روش ${this.getPaymentMethodFarsi(event.paymentMethod)} و مبلغ ${formatMoneyAmount(event.total)} تومان با موفقیت انجام شد`,
           sms: {
             templateId: this.orderCreatedSmsTemplateId,
             parameters: {
@@ -58,7 +59,7 @@ export class PaymentListeners {
           },
           pushNotif: {
             title: `پرداخت موفق`,
-            content: `پرداخت سفارش شماره ${event.orderNumber} با روش ${this.getPaymentMethodFarsi(event.paymentMethod)} و مبلغ ${event.total} تومان با موفقیت انجام شد`,
+            content: `پرداخت سفارش شماره ${event.orderNumber} با روش ${this.getPaymentMethodFarsi(event.paymentMethod)} و مبلغ ${formatMoneyAmount(event.total)} تومان با موفقیت انجام شد`,
             icon: ``,
             action: {
               type: NotifTitleEnum.PAYMENT_SUCCESS,
@@ -96,17 +97,17 @@ export class PaymentListeners {
         shopId: event.shopId,
         message: {
           title: NotifTitleEnum.ORDER_CREATED,
-          content: `سفارش شماره ${event.orderNumber} با مبلغ ${event.total} تومان با موفقیت ایجاد شد`,
+          content: `سفارش شماره ${event.orderNumber} با مبلغ ${formatMoneyAmount(event.total)} تومان با موفقیت ایجاد شد`,
           sms: {
             templateId: this.orderCreatedSmsTemplateId,
             parameters: {
               orderNumber: event.orderNumber,
-              total: event.total.toString(),
+              total: formatMoneyAmount(event.total),
             },
           },
           pushNotif: {
             title: `سفارش جدید`,
-            content: `سفارش شماره ${event.orderNumber} با مبلغ ${event.total} تومان با موفقیت ایجاد شد`,
+            content: `سفارش شماره ${event.orderNumber} با مبلغ ${formatMoneyAmount(event.total)} تومان با موفقیت ایجاد شد`,
             icon: `/`,
             action: {
               type: NotifTitleEnum.ORDER_CREATED,
@@ -137,17 +138,17 @@ export class PaymentListeners {
         shopId: event.shopId,
         message: {
           title: NotifTitleEnum.PAYMENT_SUCCESS,
-          content: `پرداخت سفارش شماره ${order.orderNumber} با روش ${this.getPaymentMethodFarsi(order.paymentMethod.method)} و مبلغ ${order.total} تومان با موفقیت انجام شد`,
+          content: `پرداخت سفارش شماره ${order.orderNumber} با روش ${this.getPaymentMethodFarsi(order.paymentMethod.method)} و مبلغ ${formatMoneyAmount(order.total)} تومان با موفقیت انجام شد`,
           sms: {
             templateId: this.paymentSucceedSmsTemplateId,
             parameters: {
               orderNumber: event.orderNumber,
-              total: event.total.toString(),
+              total: formatMoneyAmount(event.total),
             },
           },
           pushNotif: {
             title: `پرداخت موفق`,
-            content: `پرداخت سفارش شماره ${order.orderNumber} با روش ${this.getPaymentMethodFarsi(order.paymentMethod.method)} و مبلغ ${order.total} تومان با موفقیت انجام شد`,
+            content: `پرداخت سفارش شماره ${order.orderNumber} با روش ${this.getPaymentMethodFarsi(order.paymentMethod.method)} و مبلغ ${formatMoneyAmount(order.total)} تومان با موفقیت انجام شد`,
             icon: `/`,
             action: {
               type: NotifTitleEnum.PAYMENT_SUCCESS,
diff --git a/src/modules/payments/services/payments.service.ts b/src/modules/payments/services/payments.service.ts
index 5dc73d2..5a6f563 100644
--- a/src/modules/payments/services/payments.service.ts
+++ b/src/modules/payments/services/payments.service.ts
@@ -14,6 +14,7 @@ import { EventEmitter2 } from '@nestjs/event-emitter';
 import { onlinePaymentSucceedEvent, paymentSucceedEvent } from '../events/payment.events';
 import { WalletTransactionReason, WalletTransactionType } from 'src/modules/users/interface/wallet';
 import { PaymentRepository } from '../repositories/payment.repository';
+import { roundMoney } from 'src/common/utils/money.utils';
 
 @Injectable()
 export class PaymentsService {
@@ -83,7 +84,7 @@ export class PaymentsService {
 
     return {
       order,
-      amount: order.total,
+      amount: roundMoney(order.total),
       method: pm.method,
       gateway: pm.gateway ?? null,
       merchantId: pm.merchantId ?? null,
@@ -152,7 +153,7 @@ export class PaymentsService {
     });
     this.eventEmitter.emit(
       paymentSucceedEvent.name,
-      new paymentSucceedEvent(ctx.order.id, ctx.order.shop.id, String(ctx.order?.orderNumber) || '', ctx.method, ctx.amount),
+      new paymentSucceedEvent(ctx.order.id, ctx.order.shop.id, String(ctx.order?.orderNumber) || '', ctx.method, roundMoney(ctx.amount)),
     );
   }
 
@@ -234,7 +235,7 @@ export class PaymentsService {
     });
     this.eventEmitter.emit(
       onlinePaymentSucceedEvent.name,
-      new onlinePaymentSucceedEvent(payment.id, payment.order.id, payment.order.shop.id, String(payment.order?.orderNumber) || '', payment.amount),
+      new onlinePaymentSucceedEvent(payment.id, payment.order.id, payment.order.shop.id, String(payment.order?.orderNumber) || '', roundMoney(payment.amount)),
     );
     return payment;
   }
diff --git a/src/modules/products/utils/quantity.utils.ts b/src/modules/products/utils/quantity.utils.ts
index c38a521..3f52753 100644
--- a/src/modules/products/utils/quantity.utils.ts
+++ b/src/modules/products/utils/quantity.utils.ts
@@ -18,8 +18,12 @@ export function getMinQuantity(product: Product): number {
   return product.pricingType === PricingType.VARIABLE ? getQuantityStep(product) : 1;
 }
 
-export function roundQuantity(value: number): number {
-  return Math.round(value * SCALE_FACTOR) / SCALE_FACTOR;
+export function roundQuantity(value: number | string): number {
+  const numeric = Number(value);
+  if (!Number.isFinite(numeric)) {
+    return 0;
+  }
+  return Math.round(numeric * SCALE_FACTOR) / SCALE_FACTOR;
 }
 
 export function isQuantityAlignedToPitch(quantity: number, pitch: number): boolean {