diff --git a/api-spec.yaml b/api-spec.yaml
index cd5e09d..3a21e42 100644
--- a/api-spec.yaml
+++ b/api-spec.yaml
@@ -24,15 +24,18 @@ components:
         message:
           type: string
 
-    Pagination:
+    Pager:
       type: object
       properties:
         page:
           type: integer
-        pageSize:
+        limit:
           type: integer
         total:
           type: integer
+        items:
+          type: array
+          items: {} # Generic placeholder
 
     # --- User Models ---
     User:
@@ -67,7 +70,7 @@ components:
         points:
           type: integer
           readOnly: true
-        isRealNameVerified:
+        is_real_name_verified:
           type: boolean
           readOnly: true
 
@@ -111,17 +114,17 @@ components:
           enum: [video, audio, article]
         price:
           type: number
-        authorId:
+        author_id:
           type: string
-        authorName:
+        author_name:
           type: string
-        authorAvatar:
+        author_avatar:
           type: string
         views:
           type: integer
         likes:
           type: integer
-        isPurchased:
+        is_purchased:
           type: boolean
           description: User specific state
 
@@ -134,7 +137,7 @@ components:
               type: string
             body:
               type: string # HTML/Markdown
-            mediaUrls:
+            media_urls:
               type: array
               items:
                 type: object
@@ -154,10 +157,10 @@ components:
                   type: string
                 beat:
                   type: string
-            isLiked:
+            is_liked:
               type: boolean
               description: User specific state
-            isFavorited:
+            is_favorited:
               type: boolean
               description: User specific state
 
@@ -168,19 +171,19 @@ components:
           type: string
         content:
           type: string
-        userId:
+        user_id:
           type: string
-        userNickname:
+        user_nickname:
           type: string
-        userAvatar:
+        user_avatar:
           type: string
-        createTime:
+        create_time:
           type: string
         likes:
           type: integer
-        isLiked:
+        is_liked:
           type: boolean
-        replyTo:
+        reply_to:
           type: string # Comment ID
 
     # --- Tenant/Creator Public Profile ---
@@ -199,7 +202,7 @@ components:
           type: string
         description:
           type: string
-        certType:
+        cert_type:
           type: string
           enum: [personal, enterprise]
         stats:
@@ -211,7 +214,7 @@ components:
               type: integer
             likes:
               type: integer
-        isFollowing:
+        is_following:
           type: boolean
 
     # --- Order Models ---
@@ -220,10 +223,10 @@ components:
       properties:
         id:
           type: string
-        createTime:
+        create_time:
           type: string
           format: date-time
-        payTime:
+        pay_time:
           type: string
           format: date-time
         status:
@@ -237,18 +240,18 @@ components:
           type: array
           items:
             $ref: '#/components/schemas/ContentItem'
-        tenantId:
+        tenant_id:
           type: string
-        tenantName:
+        tenant_name:
           type: string
-        isVirtual:
+        is_virtual:
           type: boolean
 
     # --- Creator Dashboard Models ---
     CreatorStats:
       type: object
       properties:
-        totalFollowers:
+        total_followers:
           type: object
           properties:
             value:
@@ -256,16 +259,16 @@ components:
             trend:
               type: number
               description: Percentage change (e.g. 1.2 for +1.2%)
-        totalRevenue:
+        total_revenue:
           type: object
           properties:
             value:
               type: number
             trend:
               type: number
-        pendingRefunds:
+        pending_refunds:
           type: integer
-        newMessages:
+        new_messages:
           type: integer
 
     PayoutAccount:
@@ -295,7 +298,7 @@ components:
           type: string
         size:
           type: integer
-        mimeType:
+        mime_type:
           type: string
 
 security:
@@ -367,7 +370,7 @@ paths:
           in: query
           schema:
             type: string
-        - name: tenantId
+        - name: tenant_id
           in: query
           schema:
             type: string
@@ -387,14 +390,14 @@ paths:
           content:
             application/json:
               schema:
-                type: object
-                properties:
-                  data:
-                    type: array
-                    items:
-                      $ref: '#/components/schemas/ContentItem'
-                  pagination:
-                    $ref: '#/components/schemas/Pagination'
+                allOf:
+                  - $ref: '#/components/schemas/Pager'
+                  - type: object
+                    properties:
+                      items:
+                        type: array
+                        items:
+                          $ref: '#/components/schemas/ContentItem'
 
   /contents/{id}:
     get:
@@ -433,14 +436,14 @@ paths:
           content:
             application/json:
               schema:
-                type: object
-                properties:
-                  data:
-                    type: array
-                    items:
-                      $ref: '#/components/schemas/Comment'
-                  pagination:
-                    $ref: '#/components/schemas/Pagination'
+                allOf:
+                  - $ref: '#/components/schemas/Pager'
+                  - type: object
+                    properties:
+                      items:
+                        type: array
+                        items:
+                          $ref: '#/components/schemas/Comment'
     post:
       summary: Post a comment
       requestBody:
@@ -451,7 +454,7 @@ paths:
               properties:
                 content:
                   type: string
-                replyTo:
+                reply_to:
                   type: string
       responses:
         '200':
@@ -573,7 +576,7 @@ paths:
               properties:
                 realname:
                   type: string
-                idCard:
+                id_card:
                   type: string
       responses:
         '200':
@@ -630,9 +633,9 @@ paths:
               schema:
                 type: object
                 properties:
-                  payParams:
+                  pay_params:
                     type: string # QR code or SDK params
-                  orderId:
+                  order_id:
                     type: string
 
   /me/orders:
@@ -695,7 +698,7 @@ paths:
     post:
       summary: Add to favorites
       parameters:
-        - name: contentId
+        - name: content_id
           in: query
           required: true
           schema:
@@ -704,11 +707,11 @@ paths:
         '200':
           description: Added
 
-  /me/favorites/{contentId}:
+  /me/favorites/{content_id}:
     delete:
       summary: Remove from favorites
       parameters:
-        - name: contentId
+        - name: content_id
           in: path
           required: true
           schema:
@@ -731,7 +734,7 @@ paths:
     post:
       summary: Like content
       parameters:
-        - name: contentId
+        - name: content_id
           in: query
           required: true
           schema:
@@ -740,11 +743,11 @@ paths:
         '200':
           description: Liked
 
-  /me/likes/{contentId}:
+  /me/likes/{content_id}:
     delete:
       summary: Unlike content
       parameters:
-        - name: contentId
+        - name: content_id
           in: path
           required: true
           schema:
@@ -796,7 +799,7 @@ paths:
             schema:
               type: object
               properties:
-                contentId:
+                content_id:
                   type: string
                 sku:
                   type: string
@@ -810,7 +813,7 @@ paths:
               schema:
                 type: object
                 properties:
-                  orderId:
+                  order_id:
                     type: string
 
   /orders/{id}/pay:
@@ -838,7 +841,7 @@ paths:
               schema:
                 type: object
                 properties:
-                  payParams:
+                  pay_params:
                     type: string
 
   /orders/{id}/status:
@@ -931,7 +934,7 @@ paths:
                   type: string
                 price:
                   type: number
-                mediaIds:
+                media_ids:
                   type: array
                   items:
                     type: string
@@ -1093,7 +1096,7 @@ paths:
                 method:
                   type: string
                   enum: [wallet, external]
-                accountId:
+                account_id:
                   type: string # Required if method is external
       responses:
         '200':
@@ -1122,4 +1125,4 @@ paths:
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/UploadResult'
+                $ref: '#/components/schemas/UploadResult'
\ No newline at end of file
diff --git a/backend/app/http/v1/dto/auth.go b/backend/app/http/v1/dto/auth.go
index bf9fe53..3f3bef5 100644
--- a/backend/app/http/v1/dto/auth.go
+++ b/backend/app/http/v1/dto/auth.go
@@ -27,7 +27,7 @@ type User struct {
 	Location           *Location     `json:"location"`
 	Balance            float64       `json:"balance"`
 	Points             int64         `json:"points"`
-	IsRealNameVerified bool          `json:"isRealNameVerified"`
+	IsRealNameVerified bool          `json:"is_real_name_verified"`
 }
 
 type Location struct {
diff --git a/backend/app/http/v1/dto/common.go b/backend/app/http/v1/dto/common.go
index be435e7..6bf9ada 100644
--- a/backend/app/http/v1/dto/common.go
+++ b/backend/app/http/v1/dto/common.go
@@ -5,5 +5,5 @@ type UploadResult struct {
 	URL      string `json:"url"`
 	Filename string `json:"filename"`
 	Size     int64  `json:"size"`
-	MimeType string `json:"mimeType"`
+	MimeType string `json:"mime_type"`
 }
diff --git a/backend/app/http/v1/dto/content.go b/backend/app/http/v1/dto/content.go
index 2929183..fe0910a 100644
--- a/backend/app/http/v1/dto/content.go
+++ b/backend/app/http/v1/dto/content.go
@@ -1,7 +1,5 @@
 package dto
 
-import "quyun/v2/app/requests"
-
 type ContentItem struct {
 	ID           string  `json:"id"`
 	Title        string  `json:"title"`
@@ -9,22 +7,22 @@ type ContentItem struct {
 	Genre        string  `json:"genre"`
 	Type         string  `json:"type"` // video, audio, article
 	Price        float64 `json:"price"`
-	AuthorID     string  `json:"authorId"`
-	AuthorName   string  `json:"authorName"`
-	AuthorAvatar string  `json:"authorAvatar"`
+	AuthorID     string  `json:"author_id"`
+	AuthorName   string  `json:"author_name"`
+	AuthorAvatar string  `json:"author_avatar"`
 	Views        int     `json:"views"`
 	Likes        int     `json:"likes"`
-	IsPurchased  bool    `json:"isPurchased"`
+	IsPurchased  bool    `json:"is_purchased"`
 }
 
 type ContentDetail struct {
 	ContentItem
 	Description string     `json:"description"`
 	Body        string     `json:"body"`
-	MediaUrls   []MediaURL `json:"mediaUrls"`
+	MediaUrls   []MediaURL `json:"media_urls"`
 	Meta        Meta       `json:"meta"`
-	IsLiked     bool       `json:"isLiked"`
-	IsFavorited bool       `json:"isFavorited"`
+	IsLiked     bool       `json:"is_liked"`
+	IsFavorited bool       `json:"is_favorited"`
 }
 
 type MediaURL struct {
@@ -42,18 +40,18 @@ type Meta struct {
 type Comment struct {
 	ID           string `json:"id"`
 	Content      string `json:"content"`
-	UserID       string `json:"userId"`
-	UserNickname string `json:"userNickname"`
-	UserAvatar   string `json:"userAvatar"`
-	CreateTime   string `json:"createTime"`
+	UserID       string `json:"user_id"`
+	UserNickname string `json:"user_nickname"`
+	UserAvatar   string `json:"user_avatar"`
+	CreateTime   string `json:"create_time"`
 	Likes        int    `json:"likes"`
-	IsLiked      bool   `json:"isLiked"`
-	ReplyTo      string `json:"replyTo"`
+	IsLiked      bool   `json:"is_liked"`
+	ReplyTo      string `json:"reply_to"`
 }
 
 type CommentCreateForm struct {
 	Content string `json:"content"`
-	ReplyTo string `json:"replyTo"`
+	ReplyTo string `json:"reply_to"`
 }
 
 type Topic struct {
@@ -66,9 +64,9 @@ type Topic struct {
 
 type ContentPrice struct {
 	Currency        string  `json:"currency"`
-	PriceAmount     float64 `json:"priceAmount"`
-	DiscountType    string  `json:"discountType"`
-	DiscountValue   float64 `json:"discountValue"`
-	DiscountStartAt string  `json:"discountStartAt"`
-	DiscountEndAt   string  `json:"discountEndAt"`
-}
\ No newline at end of file
+	PriceAmount     float64 `json:"price_amount"`
+	DiscountType    string  `json:"discount_type"`
+	DiscountValue   float64 `json:"discount_value"`
+	DiscountStartAt string  `json:"discount_start_at"`
+	DiscountEndAt   string  `json:"discount_end_at"`
+}
diff --git a/backend/app/http/v1/dto/creator.go b/backend/app/http/v1/dto/creator.go
index e96e5b2..6be26f8 100644
--- a/backend/app/http/v1/dto/creator.go
+++ b/backend/app/http/v1/dto/creator.go
@@ -7,10 +7,10 @@ type ApplyForm struct {
 }
 
 type DashboardStats struct {
-	TotalFollowers IntStatItem   `json:"totalFollowers"`
-	TotalRevenue   FloatStatItem `json:"totalRevenue"`
-	PendingRefunds int           `json:"pendingRefunds"`
-	NewMessages    int           `json:"newMessages"`
+	TotalFollowers IntStatItem   `json:"total_followers"`
+	TotalRevenue   FloatStatItem `json:"total_revenue"`
+	PendingRefunds int           `json:"pending_refunds"`
+	NewMessages    int           `json:"new_messages"`
 }
 
 type IntStatItem struct {
@@ -27,14 +27,14 @@ type ContentCreateForm struct {
 	Title    string   `json:"title"`
 	Genre    string   `json:"genre"`
 	Price    float64  `json:"price"`
-	MediaIDs []string `json:"mediaIds"`
+	MediaIDs []string `json:"media_ids"`
 }
 
 type ContentUpdateForm struct {
 	Title    string   `json:"title"`
 	Genre    string   `json:"genre"`
 	Price    float64  `json:"price"`
-	MediaIDs []string `json:"mediaIds"`
+	MediaIDs []string `json:"media_ids"`
 }
 
 type RefundForm struct {
@@ -61,7 +61,7 @@ type PayoutAccount struct {
 type WithdrawForm struct {
 	Amount    float64 `json:"amount"`
 	Method    string  `json:"method"` // wallet, external
-	AccountID string  `json:"accountId"`
+	AccountID string  `json:"account_id"`
 }
 
 // Re-export or Wrap
diff --git a/backend/app/http/v1/dto/order.go b/backend/app/http/v1/dto/order.go
index adc4e67..bc10a95 100644
--- a/backend/app/http/v1/dto/order.go
+++ b/backend/app/http/v1/dto/order.go
@@ -1,13 +1,13 @@
 package dto
 
 type OrderCreateForm struct {
-	ContentID string `json:"contentId"`
+	ContentID string `json:"content_id"`
 	Sku       string `json:"sku"`
 	Quantity  int    `json:"quantity"`
 }
 
 type OrderCreateResponse struct {
-	OrderID string `json:"orderId"`
+	OrderID string `json:"order_id"`
 }
 
 type OrderPayForm struct {
@@ -15,7 +15,7 @@ type OrderPayForm struct {
 }
 
 type OrderPayResponse struct {
-	PayParams string `json:"payParams"`
+	PayParams string `json:"pay_params"`
 }
 
 type OrderStatusResponse struct {
diff --git a/backend/app/http/v1/dto/tenant.go b/backend/app/http/v1/dto/tenant.go
index 5b8c70f..b6e20bd 100644
--- a/backend/app/http/v1/dto/tenant.go
+++ b/backend/app/http/v1/dto/tenant.go
@@ -7,9 +7,9 @@ type TenantProfile struct {
 	Cover       string `json:"cover"`
 	Bio         string `json:"bio"`
 	Description string `json:"description"`
-	CertType    string `json:"certType"` // personal, enterprise
+	CertType    string `json:"cert_type"` // personal, enterprise
 	Stats       Stats  `json:"stats"`
-	IsFollowing bool   `json:"isFollowing"`
+	IsFollowing bool   `json:"is_following"`
 }
 
 type Stats struct {
diff --git a/backend/app/http/v1/dto/user.go b/backend/app/http/v1/dto/user.go
index a1b1396..24d3afb 100644
--- a/backend/app/http/v1/dto/user.go
+++ b/backend/app/http/v1/dto/user.go
@@ -13,7 +13,7 @@ type UserUpdate struct {
 
 type RealNameForm struct {
 	Realname string `json:"realname"`
-	IDCard   string `json:"idCard"`
+	IDCard   string `json:"id_card"`
 }
 
 type WalletResponse struct {
@@ -35,21 +35,21 @@ type RechargeForm struct {
 }
 
 type RechargeResponse struct {
-	PayParams string `json:"payParams"`
-	OrderID   string `json:"orderId"`
+	PayParams string `json:"pay_params"`
+	OrderID   string `json:"order_id"`
 }
 
 type Order struct {
 	ID         string        `json:"id"`
-	CreateTime string        `json:"createTime"`
-	PayTime    string        `json:"payTime"`
+	CreateTime string        `json:"create_time"`
+	PayTime    string        `json:"pay_time"`
 	Status     string        `json:"status"`
 	Amount     float64       `json:"amount"`
 	Quantity   int           `json:"quantity"`
 	Items      []ContentItem `json:"items"`
-	TenantID   string        `json:"tenantId"`
-	TenantName string        `json:"tenantName"`
-	IsVirtual  bool          `json:"isVirtual"`
+	TenantID   string        `json:"tenant_id"`
+	TenantName string        `json:"tenant_name"`
+	IsVirtual  bool          `json:"is_virtual"`
 }
 
 type Notification struct {