diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePAPayExtensions.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePAPayExtensions.cs
index bef3baeb..93c4aa45 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePAPayExtensions.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePAPayExtensions.cs
@@ -356,6 +356,28 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3
 
             return await client.SendFlurlRequestAsJsonAsync<Models.ApplyPAPayPayTransactionResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
         }
+
+        /// <summary>
+        /// <para>异步调用 [POST] /papay/pay/harmony/transactions/apply 接口。</para>
+        /// <para>
+        /// REF: <br/>
+        /// <![CDATA[ https://pay.weixin.qq.com/doc/v3/merchant/4013388429 ]]>
+        /// </para>
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="request"></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        public static async Task<Models.ApplyPAPayPayTransactionHarmonyResponse> ExecuteApplyPAPayPayTransactionHarmonyAsync(this WechatTenpayClient client, Models.ApplyPAPayPayTransactionHarmonyRequest request, CancellationToken cancellationToken = default)
+        {
+            if (client is null) throw new ArgumentNullException(nameof(client));
+            if (request is null) throw new ArgumentNullException(nameof(request));
+
+            IFlurlRequest flurlReq = client
+                .CreateFlurlRequest(request, HttpMethod.Post, "papay", "pay", "harmony", "transactions", "apply");
+
+            return await client.SendFlurlRequestAsJsonAsync<Models.ApplyPAPayPayTransactionHarmonyResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
+        }
         #endregion
 
         #region ScheduledDeductSign
diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyRequest.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyRequest.cs
new file mode 100644
index 00000000..c89821a3
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyRequest.cs
@@ -0,0 +1,85 @@
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /papay/pay/harmony/transactions/apply 接口的请求。</para>
+    /// </summary>
+    public class ApplyPAPayPayTransactionHarmonyRequest : WechatTenpayRequest
+    {
+        public static class Types
+        {
+            public class Amount : ApplyPAPayPayTransactionRequest.Types.Amount
+            {
+            }
+        }
+
+        /// <summary>
+        /// 获取或设置微信 AppId。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("appid")]
+        [System.Text.Json.Serialization.JsonPropertyName("appid")]
+        public string AppId { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 获取或设置商户订单号。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("out_trade_no")]
+        [System.Text.Json.Serialization.JsonPropertyName("out_trade_no")]
+        public string OutTradeNumber { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 获取或设置商品描述。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("description")]
+        [System.Text.Json.Serialization.JsonPropertyName("description")]
+        public string Description { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 获取或设置委托代扣签约协议 ID。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("contract_id")]
+        [System.Text.Json.Serialization.JsonPropertyName("contract_id")]
+        public string ContractId { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 获取或设置回调通知地址。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("transaction_notify_url")]
+        [System.Text.Json.Serialization.JsonPropertyName("transaction_notify_url")]
+        public string NotifyUrl { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 获取或设置订单优惠标记。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("goods_tag")]
+        [System.Text.Json.Serialization.JsonPropertyName("goods_tag")]
+        public string? GoodsTag { get; set; }
+
+        /// <summary>
+        /// 获取或设置附加数据。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("attach")]
+        [System.Text.Json.Serialization.JsonPropertyName("attach")]
+        public string? Attachment { get; set; }
+
+        /// <summary>
+        /// 获取或设置金额信息。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("amount")]
+        [System.Text.Json.Serialization.JsonPropertyName("amount")]
+        public Types.Amount Amount { get; set; } = new Types.Amount();
+
+        /// <summary>
+        /// 获取或设置鸿蒙账户 ID。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("harmony_account_id")]
+        [System.Text.Json.Serialization.JsonPropertyName("harmony_account_id")]
+        public string HarmonyAccountId { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 获取或设置商户行业编码。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("mcc")]
+        [System.Text.Json.Serialization.JsonPropertyName("mcc")]
+        public string? MerchantCategoryCode { get; set; }
+    }
+}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyResponse.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyResponse.cs
new file mode 100644
index 00000000..bcf528ea
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyResponse.cs
@@ -0,0 +1,29 @@
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /papay/pay/harmony/transactions/apply 接口的响应。</para>
+    /// </summary>
+    public class ApplyPAPayPayTransactionHarmonyResponse : WechatTenpayResponse
+    {
+        public static class Types
+        {
+            public class Amount : ApplyPAPayPayTransactionResponse.Types.Amount
+            {
+            }
+        }
+
+        /// <summary>
+        /// 获取或设置商户订单号。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("out_trade_no")]
+        [System.Text.Json.Serialization.JsonPropertyName("out_trade_no")]
+        public string OutTradeNumber { get; set; } = default!;
+
+        /// <summary>
+        /// 获取或设置扣费金额信息。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("amount")]
+        [System.Text.Json.Serialization.JsonPropertyName("amount")]
+        public Types.Amount Amount { get; set; } = default!;
+    }
+}
diff --git a/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyRequest.json b/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyRequest.json
new file mode 100644
index 00000000..dc7b78e3
--- /dev/null
+++ b/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyRequest.json
@@ -0,0 +1,15 @@
+{
+    "appid": "wxd678efh567hg6787",
+    "out_trade_no": "1217752501201407033233368018",
+    "description": "Image形象店-深圳腾大-QQ公仔",
+    "transaction_notify_url": "https://www.qq.com/",
+    "contract_id": "123124412412423431",
+    "amount": {
+        "total": 1,
+        "currency": "CNY"
+    },
+    "goods_tag": "DISCOUNTS",
+    "attach": "自定义数据",
+    "harmony_account_id": "example_harmony_account_id",
+    "mcc": "5734"
+}
diff --git a/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyResponse.json b/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyResponse.json
new file mode 100644
index 00000000..b00f2f76
--- /dev/null
+++ b/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/PAPay/PayTransactions/ApplyPAPayPayTransactionHarmonyResponse.json
@@ -0,0 +1,7 @@
+{
+    "out_trade_no": "1217752501201407033233368018",
+    "amount": {
+        "total": 1,
+        "currency": "CNY"
+    }
+}