diff --git a/src/modules/coupons/providers/coupon.service.ts b/src/modules/coupons/providers/coupon.service.ts
index 059cce1..20aef1e 100644
--- a/src/modules/coupons/providers/coupon.service.ts
+++ b/src/modules/coupons/providers/coupon.service.ts
@@ -19,8 +19,8 @@ export class CouponService {
     private readonly em: EntityManager,
   ) { }
 
-  async create(restId: string, createCouponDto: CreateCouponDto): Promise<Coupon> {
-    const shop = await this.shopRepository.findOne({ id: restId });
+  async create(shopId: string, createCouponDto: CreateCouponDto): Promise<Coupon> {
+    const shop = await this.shopRepository.findOne({ id: shopId });
     if (!shop) {
       throw new NotFoundException(RestMessage.NOT_FOUND);
     }
@@ -76,8 +76,8 @@ export class CouponService {
     return coupon;
   }
 
-  findAll(restId: string, dto: FindCouponsDto) {
-    return this.couponRepository.findAllPaginated(restId, dto);
+  findAll(shopId: string, dto: FindCouponsDto) {
+    return this.couponRepository.findAllPaginated(shopId, dto);
   }
 
   async findById(id: string): Promise<Coupon> {
@@ -88,8 +88,8 @@ export class CouponService {
     return coupon;
   }
 
-  async findByCode(code: string, restId: string): Promise<Coupon> {
-    const coupon = await this.couponRepository.findOne({ code, shop: { id: restId } });
+  async findByCode(code: string, shopId: string): Promise<Coupon> {
+    const coupon = await this.couponRepository.findOne({ code, shop: { id: shopId } });
     if (!coupon) {
       throw new NotFoundException(CouponMessage.NOT_FOUND);
     }
@@ -160,7 +160,7 @@ export class CouponService {
    */
   async validateCoupon(
     code: string,
-    restId: string,
+    shopId: string,
     orderAmount: number,
     userPhone: string,
   ): Promise<{
@@ -169,7 +169,7 @@ export class CouponService {
     message?: string;
   }> {
     const coupon = await this.couponRepository.findOne(
-      { code, shop: { id: restId } },
+      { code, shop: { id: shopId } },
       { populate: ['shop'] },
     );
 
@@ -245,7 +245,7 @@ export class CouponService {
     }
   }
 
-  generateShortCode(restaurantSlug: string, length = 5) {
+  generateShortCode(shopSlug: string, length = 5) {
     const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
     const bytes = randomBytes(length);
     let result = '';
@@ -253,19 +253,19 @@ export class CouponService {
     for (let i = 0; i < bytes.length; i++) {
       result += chars[bytes[i] % chars.length];
     }
-    const prefix = restaurantSlug.slice(0, 2).toUpperCase();
+    const prefix = shopSlug.slice(0, 2).toUpperCase();
     return prefix + '-' + result;
   }
 
-  async generateCouponCode(restId: string): Promise<string> {
-    const shop = await this.shopRepository.findOne({ id: restId });
+  async generateCouponCode(shopId: string): Promise<{ code: string }> {
+    const shop = await this.shopRepository.findOne({ id: shopId });
     if (!shop) {
       throw new NotFoundException(RestMessage.NOT_FOUND);
     }
     const code = this.generateShortCode(shop.slug);
-    const existing = await this.couponRepository.findOne({ code, shop: { id: restId } });
+    const existing = await this.couponRepository.findOne({ code, shop: { id: shopId } });
 
-    if (existing) return this.generateCouponCode(restId);
-    return code;
+    if (existing) return this.generateCouponCode(shopId);
+    return { code }
   }
 }