diff --git a/server/HoneyBox/src/HoneyBox.Api/Controllers/WelfareController.cs b/server/HoneyBox/src/HoneyBox.Api/Controllers/WelfareController.cs
index ee768c9d..d3fd8864 100644
--- a/server/HoneyBox/src/HoneyBox.Api/Controllers/WelfareController.cs
+++ b/server/HoneyBox/src/HoneyBox.Api/Controllers/WelfareController.cs
@@ -158,11 +158,10 @@ public class WelfareController : ControllerBase
     /// <summary>
     /// 福利屋购买/参与
     /// POST /api/fuliwu_buy
-    /// Requirements: 4.2
     /// </summary>
     [HttpPost("fuliwu_buy")]
     [Authorize]
-    public async Task<ApiResponse<WelfareBuyResponse>> BuyWelfare([FromForm] WelfareBuyRequest request)
+    public async Task<ApiResponse<WelfareBuyResponse>> BuyWelfare([FromBody] WelfareBuyRequest request)
     {
         var userId = GetCurrentUserId();
         if (userId == null)
@@ -170,6 +169,8 @@ public class WelfareController : ControllerBase
             return ApiResponse<WelfareBuyResponse>.Unauthorized();
         }
 
+        _logger.LogInformation("BuyWelfare: UserId={UserId}, GoodsId={GoodsId}", userId, request.GoodsId);
+
         try
         {
             var result = await _welfareService.BuyWelfareAsync(userId.Value, request);
diff --git a/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs b/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs
index 73fe673c..00c9ce69 100644
--- a/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs
+++ b/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs
@@ -549,31 +549,37 @@ public class WelfareBuyRequest
     /// <summary>
     /// 商品ID
     /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("goods_id")]
     public int GoodsId { get; set; }
 
     /// <summary>
     /// 购买数量/抽奖次数
     /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("prize_num")]
     public int PrizeNum { get; set; } = 1;
 
     /// <summary>
     /// 是否使用余额抵扣 0=不抵扣 1=抵扣
     /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("use_money_is")]
     public int UseMoneyIs { get; set; }
 
     /// <summary>
     /// 是否使用积分抵扣 0=不抵扣 1=抵扣
     /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("use_integral_is")]
     public int UseIntegralIs { get; set; }
 
     /// <summary>
     /// 是否使用货币2抵扣 0=不抵扣 1=抵扣
     /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("use_money2_is")]
     public int UseMoney2Is { get; set; }
 
     /// <summary>
     /// 优惠券ID
     /// </summary>
+    [System.Text.Json.Serialization.JsonPropertyName("coupon_id")]
     public int CouponId { get; set; }
 }