diff --git a/CHANGELOG.md b/CHANGELOG.md
index def5b7208..63fa3b650 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # CHANGELOG
 
+## v7.12.0 (2026-10-29)
+
+- Adds `ManufacturerProductId` and `StandardizedProductId` properties to the `CustomsItem` API model and create parameters
+- Adds `Address` property to the `TaxIdentifier` API model and create parameters
+
 ## v7.11.0 (2026-10-27)
 
 - Removes the deprecated, unusable `ReferralCustomer.AddCreditCardToUser` function
diff --git a/EasyPost.nuspec b/EasyPost.nuspec
index 1fb0ed691..5074ac646 100644
--- a/EasyPost.nuspec
+++ b/EasyPost.nuspec
@@ -3,7 +3,7 @@
     <metadata>
         <id>EasyPost-Official</id>
         <title>EasyPost (Official)</title>
-        <version>7.11.0</version>
+        <version>7.12.0</version>
         <authors>EasyPost</authors>
         <owners>EasyPost</owners>
         <projectUrl>https://www.easypost.com</projectUrl>
diff --git a/EasyPost/Models/API/CustomsItem.cs b/EasyPost/Models/API/CustomsItem.cs
index 01e6d485b..bf01c094b 100644
--- a/EasyPost/Models/API/CustomsItem.cs
+++ b/EasyPost/Models/API/CustomsItem.cs
@@ -49,6 +49,12 @@ public class CustomsItem : EasyPostObject, Parameters.ICustomsItemParameter
         [JsonProperty("manufacturer")]
         public string? Manufacturer { get; set; }
 
+        /// <summary>
+        ///     Manufacturer-assigned product identifier (NS-PID) for the item.
+        /// </summary>
+        [JsonProperty("manufacturer_product_id")]
+        public string? ManufacturerProductId { get; set; }
+
         /// <summary>
         ///     The two-letter ISO 3166 country code where the item is being shipped from.
         /// </summary>
@@ -67,6 +73,12 @@ public class CustomsItem : EasyPostObject, Parameters.ICustomsItemParameter
         [JsonProperty("quantity")]
         public int? Quantity { get; set; }
 
+        /// <summary>
+        ///     Standardized product identifier (S-PID) for the item, such as a GTIN or EAN.
+        /// </summary>
+        [JsonProperty("standardized_product_id")]
+        public string? StandardizedProductId { get; set; }
+
         /// <summary>
         ///     The value of the item being shipped, in US Dollars.
         ///     Total value should equal unit value multiplied by the <see cref="Quantity"/>.
diff --git a/EasyPost/Models/API/TaxIdentifier.cs b/EasyPost/Models/API/TaxIdentifier.cs
index 2f61c8e44..c57a85b47 100644
--- a/EasyPost/Models/API/TaxIdentifier.cs
+++ b/EasyPost/Models/API/TaxIdentifier.cs
@@ -11,6 +11,12 @@ public class TaxIdentifier : EasyPostObject, Parameters.ITaxIdentifierParameter
     {
         #region JSON Properties
 
+        /// <summary>
+        ///     The <see cref="Address"/> associated with the <see cref="TaxId"/>.
+        /// </summary>
+        [JsonProperty("address")]
+        public Address? Address { get; set; }
+
         /// <summary>
         ///     Which entity the <see cref="TaxId"/> belongs to.
         ///     Possible values are:
diff --git a/EasyPost/Parameters/CustomsItem/Create.cs b/EasyPost/Parameters/CustomsItem/Create.cs
index 712336fef..6a19bea60 100644
--- a/EasyPost/Parameters/CustomsItem/Create.cs
+++ b/EasyPost/Parameters/CustomsItem/Create.cs
@@ -88,6 +88,20 @@ public class Create : BaseParameters<Models.API.CustomsItem>, ICustomsItemParame
         [NestedRequestParameter(typeof(CustomsInfo.Create), Necessity.Optional, "eccn")]
         public string? Eccn { get; set; }
 
+        /// <summary>
+        ///     Manufacturer-assigned product identifier (NS-PID) for the item.
+        /// </summary>
+        [TopLevelRequestParameter(Necessity.Optional, "customs_item", "manufacturer_product_id")]
+        [NestedRequestParameter(typeof(CustomsInfo.Create), Necessity.Optional, "manufacturer_product_id")]
+        public string? ManufacturerProductId { get; set; }
+
+        /// <summary>
+        ///     Standardized product identifier (S-PID) for the item, such as a GTIN or EAN.
+        /// </summary>
+        [TopLevelRequestParameter(Necessity.Optional, "customs_item", "standardized_product_id")]
+        [NestedRequestParameter(typeof(CustomsInfo.Create), Necessity.Optional, "standardized_product_id")]
+        public string? StandardizedProductId { get; set; }
+
         #endregion
     }
 }
diff --git a/EasyPost/Parameters/TaxIdentifier/Create.cs b/EasyPost/Parameters/TaxIdentifier/Create.cs
index 66734cdc1..22d93e0da 100644
--- a/EasyPost/Parameters/TaxIdentifier/Create.cs
+++ b/EasyPost/Parameters/TaxIdentifier/Create.cs
@@ -35,6 +35,12 @@ public class Create : BaseParameters<Models.API.TaxIdentifier>, ITaxIdentifierPa
         [NestedRequestParameter(typeof(Shipment.Create), Necessity.Optional, "issuing_country")]
         public string? IssuingCountry { get; set; }
 
+        /// <summary>
+        ///     The <see cref="Models.API.Address"/> associated with the tax identification number.
+        /// </summary>
+        [NestedRequestParameter(typeof(Shipment.Create), Necessity.Optional, "address")]
+        public Models.API.Address? Address { get; set; }
+
         #endregion
     }
 }
diff --git a/EasyPost/Properties/VersionInfo.cs b/EasyPost/Properties/VersionInfo.cs
index 358d45142..6a0001098 100644
--- a/EasyPost/Properties/VersionInfo.cs
+++ b/EasyPost/Properties/VersionInfo.cs
@@ -2,6 +2,6 @@
 
 // Version information for an assembly must follow semantic versioning
 // When releasing a release candidate, append a 4th digit being the number of the release candidate
-[assembly: AssemblyVersion("7.11.0")]
-[assembly: AssemblyFileVersion("7.11.0")]
-[assembly: AssemblyInformationalVersion("7.11.0")]
+[assembly: AssemblyVersion("7.12.0")]
+[assembly: AssemblyFileVersion("7.12.0")]
+[assembly: AssemblyInformationalVersion("7.12.0")]