diff --git a/src/Oms.Application/Integrations/SmallBagTrack/PickupBigBagTrackSyncer.cs b/src/Oms.Application/Integrations/SmallBagTrack/PickupBigBagTrackSyncer.cs
index 7081b08..edffb5b 100644
--- a/src/Oms.Application/Integrations/SmallBagTrack/PickupBigBagTrackSyncer.cs
+++ b/src/Oms.Application/Integrations/SmallBagTrack/PickupBigBagTrackSyncer.cs
@@ -1,5 +1,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Logging;
+using Oms.Application.Integrations.Itfx;
+using Oms.Domain.ChannelsAggregate.Entities;
 using Oms.Domain.ChannelsAggregate.Repositories;
 using Oms.Domain.OrdersAggregate.Consts;
 using Oms.Domain.OrdersAggregate.Entities;
@@ -45,6 +47,8 @@ internal sealed class PickupBigBagTrackSyncer(
     IPickupOrderLineRepository pickupOrderLineRepository,
     ISalesProductRepository salesProductRepository,
     IServiceChannelRepository serviceChannelRepository,
+    IServiceChannelGroupRepository serviceChannelGroupRepository,
+    IItfxMetadataClient itfxMetadataClient,
     IHttpContextAccessor httpContextAccessor,
     ILogger<PickupBigBagTrackSyncer> logger) : IPickupBigBagTrackSyncer
 {
@@ -83,7 +87,7 @@ internal sealed class PickupBigBagTrackSyncer(
 
         try
         {
-            var (channel, product) = await ResolveChannelProductAsync(pickup.CarrierService, cancellationToken);
+            var (channel, product, apiCode) = await ResolveChannelProductAsync(pickup.CarrierService, cancellationToken);
             var country = ResolveCountry(pickup);
 
             // 1) UpsertBigBag：client 取 product（销售产品编码）
@@ -96,6 +100,7 @@ internal sealed class PickupBigBagTrackSyncer(
                     Channel = channel,
                     Product = product,
                     Country = country,
+                    ApiCode = apiCode,
                     Authorization = authorization
                 },
                 cancellationToken);
@@ -215,20 +220,20 @@ internal sealed class PickupBigBagTrackSyncer(
         }
     }
 
-    private async Task<(string? Channel, string? Product)> ResolveChannelProductAsync(
+    private async Task<(string? Channel, string? Product, string? ApiCode)> ResolveChannelProductAsync(
         string? carrierService,
         CancellationToken cancellationToken)
     {
         var salesProductCode = carrierService?.Trim();
         if (string.IsNullOrWhiteSpace(salesProductCode))
         {
-            return (null, null);
+            return (null, null, null);
         }
 
         var product = await salesProductRepository.GetByProductCodeAsync(salesProductCode, cancellationToken);
         if (product == null)
         {
-            return (null, salesProductCode);
+            return (null, salesProductCode, null);
         }
 
         var providers = await salesProductRepository.GetAllocationProvidersAsync(product.Id, cancellationToken);
@@ -239,14 +244,42 @@ internal sealed class PickupBigBagTrackSyncer(
             .FirstOrDefault();
         if (channelId <= 0)
         {
-            return (null, product.ProductCode);
+            return (null, product.ProductCode, null);
         }
 
         var channel = await serviceChannelRepository.FirstOrDefaultAsync(x => x.Id == channelId, cancellationToken);
         var channelCode = channel?.ChannelCode?.Trim();
+        var apiCode = channel == null
+            ? null
+            : await ResolveApiCodeFromServiceChannelAsync(channel, cancellationToken);
         return (
             string.IsNullOrWhiteSpace(channelCode) ? null : channelCode,
-            product.ProductCode);
+            product.ProductCode,
+            apiCode);
+    }
+
+    private async Task<string?> ResolveApiCodeFromServiceChannelAsync(
+        ServiceChannel channel,
+        CancellationToken cancellationToken)
+    {
+        if (!channel.GroupId.HasValue || channel.GroupId.Value <= 0)
+        {
+            return null;
+        }
+
+        var group = await serviceChannelGroupRepository.FirstOrDefaultAsync(
+            x => x.Id == channel.GroupId.Value,
+            cancellationToken);
+        if (group == null || group.ApiServiceProviderId <= 0)
+        {
+            return null;
+        }
+
+        var serviceProvider = await itfxMetadataClient.GetServiceProviderAsync(
+            group.ApiServiceProviderId,
+            cancellationToken);
+        var code = serviceProvider?.Code?.Trim();
+        return string.IsNullOrWhiteSpace(code) ? null : code;
     }
 
     private static string ResolveCountry(PickupOrder pickup)
diff --git a/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackOrderClient.cs b/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackOrderClient.cs
index b6e5077..ecb80a1 100644
--- a/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackOrderClient.cs
+++ b/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackOrderClient.cs
@@ -260,7 +260,8 @@ internal sealed class SmallBagTrackOrderClient(
             OtherNo = request.OtherNo?.Trim() ?? string.Empty,
             Channel = request.Channel?.Trim() ?? string.Empty,
             Product = request.Product?.Trim() ?? string.Empty,
-            Country = request.Country?.Trim() ?? string.Empty
+            Country = request.Country?.Trim() ?? string.Empty,
+            ApiCode = request.ApiCode?.Trim() ?? string.Empty
         };
         var url = SmallBagTrackUpsertBigBagApiRequest.BuildEndpointUrl(settings.BaseUrl);
         var authorization = ResolveAuthorization(request.Authorization);
diff --git a/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagApiRequest.cs b/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagApiRequest.cs
index 72e1c00..a694b0c 100644
--- a/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagApiRequest.cs
+++ b/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagApiRequest.cs
@@ -17,6 +17,8 @@ internal sealed class SmallBagTrackUpsertBigBagApiRequest
 
     public string Country { get; set; } = string.Empty;
 
+    public string ApiCode { get; set; } = string.Empty;
+
     public static string BuildEndpointUrl(string baseUrl) =>
         $"{baseUrl.Trim().TrimEnd('/')}/ProviderService/Order/UpsertBigBag";
 }
diff --git a/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagRequest.cs b/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagRequest.cs
index 3635ec7..9ac9c1a 100644
--- a/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagRequest.cs
+++ b/src/Oms.Application/Integrations/SmallBagTrack/SmallBagTrackUpsertBigBagRequest.cs
@@ -17,5 +17,10 @@ public class SmallBagTrackUpsertBigBagRequest
 
     public string? Country { get; set; }
 
+    /// <summary>
+    /// API 服务商 code（轨迹拉取配置 ServiceProviderCode）。
+    /// </summary>
+    public string? ApiCode { get; set; }
+
     public string? Authorization { get; set; }
 }