diff --git a/Sources/AppStoreServerLibrary/Models/AppTransaction.swift b/Sources/AppStoreServerLibrary/Models/AppTransaction.swift
index 55a4b39..a1d5c6a 100644
--- a/Sources/AppStoreServerLibrary/Models/AppTransaction.swift
+++ b/Sources/AppStoreServerLibrary/Models/AppTransaction.swift
@@ -8,8 +8,8 @@ import Foundation
 ///[AppTransaction](https://developer.apple.com/documentation/storekit/apptransaction)
 public struct AppTransaction: DecodedSignedData, Decodable, Encodable, Hashable, Sendable {
     
-    public init(receiptType: AppStoreEnvironment? = nil, appAppleId: Int64? = nil, bundleId: String? = nil, applicationVersion: String? = nil, versionExternalIdentifier: Int64? = nil, receiptCreationDate: Date? = nil, originalPurchaseDate: Date? = nil, originalApplicationVersion: String? = nil, deviceVerification: String? = nil, deviceVerificationNonce: UUID? = nil, preorderDate: Date? = nil, appTransactionId: String? = nil, originalPlatform: PurchasePlatform? = nil) {
-        self.receiptType = receiptType
+    public init(environment: AppStoreEnvironment? = nil, appAppleId: Int64? = nil, bundleId: String? = nil, applicationVersion: String? = nil, versionExternalIdentifier: Int64? = nil, receiptCreationDate: Date? = nil, originalPurchaseDate: Date? = nil, originalApplicationVersion: String? = nil, deviceVerification: String? = nil, deviceVerificationNonce: UUID? = nil, preorderDate: Date? = nil, appTransactionId: String? = nil, originalPlatform: PurchasePlatform? = nil) {
+        self.environment = environment
         self.appAppleId = appAppleId
         self.bundleId = bundleId
         self.applicationVersion = applicationVersion
@@ -24,8 +24,8 @@ public struct AppTransaction: DecodedSignedData, Decodable, Encodable, Hashable,
         self.originalPlatform = originalPlatform
     }
     
-    public init(rawReceiptType: String? = nil, appAppleId: Int64? = nil, bundleId: String? = nil, applicationVersion: String? = nil, versionExternalIdentifier: Int64? = nil, receiptCreationDate: Date? = nil, originalPurchaseDate: Date? = nil, originalApplicationVersion: String? = nil, deviceVerification: String? = nil, deviceVerificationNonce: UUID? = nil, preorderDate: Date? = nil, appTransactionId: String? = nil, rawOriginalPlatform: String? = nil) {
-        self.rawReceiptType = rawReceiptType
+    public init(rawEnvironment: String? = nil, appAppleId: Int64? = nil, bundleId: String? = nil, applicationVersion: String? = nil, versionExternalIdentifier: Int64? = nil, receiptCreationDate: Date? = nil, originalPurchaseDate: Date? = nil, originalApplicationVersion: String? = nil, deviceVerification: String? = nil, deviceVerificationNonce: UUID? = nil, preorderDate: Date? = nil, appTransactionId: String? = nil, rawOriginalPlatform: String? = nil) {
+        self.rawEnvironment = rawEnvironment
         self.appAppleId = appAppleId
         self.bundleId = bundleId
         self.applicationVersion = applicationVersion
@@ -43,17 +43,17 @@ public struct AppTransaction: DecodedSignedData, Decodable, Encodable, Hashable,
     ///The server environment that signs the app transaction.
     ///
     ///[environment](https://developer.apple.com/documentation/storekit/apptransaction/3963901-environment)
-    public var receiptType: AppStoreEnvironment?  {
+    public var environment: AppStoreEnvironment?  {
         get {
-            return rawReceiptType.flatMap { AppStoreEnvironment(rawValue: $0) }
+            return rawEnvironment.flatMap { AppStoreEnvironment(rawValue: $0) }
         }
         set {
-            self.rawReceiptType = newValue.map { $0.rawValue }
+            self.rawEnvironment = newValue.map { $0.rawValue }
         }
     }
     
-    ///See ``receiptType``
-    public var rawReceiptType: String?
+    ///See ``environment``
+    public var rawEnvironment: String?
     
     ///The unique identifier the App Store uses to identify the app.
     ///
@@ -135,7 +135,8 @@ public struct AppTransaction: DecodedSignedData, Decodable, Encodable, Hashable,
     
     
     public enum CodingKeys: CodingKey {
-        case receiptType
+        case environment
+        case receiptType // For backward compatibility
         case appAppleId
         case bundleId
         case applicationVersion
@@ -152,7 +153,14 @@ public struct AppTransaction: DecodedSignedData, Decodable, Encodable, Hashable,
     
     public init(from decoder: any Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
-        self.rawReceiptType = try container.decodeIfPresent(String.self, forKey: .receiptType)
+        // Try environment first, then fall back to receiptType for backward compatibility
+        if let environmentValue = try container.decodeIfPresent(String.self, forKey: .environment) {
+            self.rawEnvironment = environmentValue
+        } else if let receiptTypeValue = try container.decodeIfPresent(String.self, forKey: .receiptType) {
+            self.rawEnvironment = receiptTypeValue
+        } else {
+            self.rawEnvironment = nil
+        }
         self.appAppleId = try container.decodeIfPresent(Int64.self, forKey: .appAppleId)
         self.bundleId = try container.decodeIfPresent(String.self, forKey: .bundleId)
         self.applicationVersion = try container.decodeIfPresent(String.self, forKey: .applicationVersion)
@@ -169,7 +177,7 @@ public struct AppTransaction: DecodedSignedData, Decodable, Encodable, Hashable,
     
     public func encode(to encoder: any Encoder) throws {
         var container = encoder.container(keyedBy: CodingKeys.self)
-        try container.encodeIfPresent(self.rawReceiptType, forKey: .receiptType)
+        try container.encodeIfPresent(self.rawEnvironment, forKey: .environment)
         try container.encodeIfPresent(self.appAppleId, forKey: .appAppleId)
         try container.encodeIfPresent(self.bundleId, forKey: .bundleId)
         try container.encodeIfPresent(self.applicationVersion, forKey: .applicationVersion)
diff --git a/Sources/AppStoreServerLibrary/SignedDataVerifier.swift b/Sources/AppStoreServerLibrary/SignedDataVerifier.swift
index 2df7b3a..77fe5ae 100644
--- a/Sources/AppStoreServerLibrary/SignedDataVerifier.swift
+++ b/Sources/AppStoreServerLibrary/SignedDataVerifier.swift
@@ -135,7 +135,7 @@ public struct SignedDataVerifier {
         let appTransactionResult = await decodeSignedData(signedData: signedAppTransaction, type: AppTransaction.self)
         switch appTransactionResult {
         case .valid(let appTransaction):
-            let environment = appTransaction.receiptType
+            let environment = appTransaction.environment
             if self.bundleId != appTransaction.bundleId || (self.environment == .production && self.appAppleId != appTransaction.appAppleId) {
                 return VerificationResult.invalid(VerificationError.INVALID_APP_IDENTIFIER)
             }
diff --git a/Tests/AppStoreServerLibraryTests/SignedModelTests.swift b/Tests/AppStoreServerLibraryTests/SignedModelTests.swift
index 2e4d555..82affe0 100644
--- a/Tests/AppStoreServerLibraryTests/SignedModelTests.swift
+++ b/Tests/AppStoreServerLibraryTests/SignedModelTests.swift
@@ -267,8 +267,8 @@ final class SignedModelTests: XCTestCase {
             return
         }
 
-        XCTAssertEqual(AppStoreEnvironment.localTesting, appTransaction.receiptType)
-        XCTAssertEqual("LocalTesting", appTransaction.rawReceiptType)
+        XCTAssertEqual(AppStoreEnvironment.localTesting, appTransaction.environment)
+        XCTAssertEqual("LocalTesting", appTransaction.rawEnvironment)
         XCTAssertEqual(531412, appTransaction.appAppleId)
         XCTAssertEqual("com.example", appTransaction.bundleId)
         XCTAssertEqual("1.2.3", appTransaction.applicationVersion)
diff --git a/Tests/AppStoreServerLibraryTests/XcodeSignedDataVerifierTests.swift b/Tests/AppStoreServerLibraryTests/XcodeSignedDataVerifierTests.swift
index 2ebac36..06610b3 100644
--- a/Tests/AppStoreServerLibraryTests/XcodeSignedDataVerifierTests.swift
+++ b/Tests/AppStoreServerLibraryTests/XcodeSignedDataVerifierTests.swift
@@ -28,8 +28,8 @@ final class XcodeSignedDataVerifierTests: XCTestCase {
         XCTAssertEqual("cYUsXc53EbYc0pOeXG5d6/31LGHeVGf84sqSN0OrJi5u/j2H89WWKgS8N0hMsMlf", appTransaction.deviceVerification)
         XCTAssertEqual(UUID(uuidString: "48c8b92d-ce0d-4229-bedf-e61b4f9cfc92"), appTransaction.deviceVerificationNonce)
         XCTAssertNil(appTransaction.preorderDate)
-        XCTAssertEqual(.xcode, appTransaction.receiptType)
-        XCTAssertEqual("Xcode", appTransaction.rawReceiptType)
+        XCTAssertEqual(.xcode, appTransaction.environment)
+        XCTAssertEqual("Xcode", appTransaction.rawEnvironment)
         confirmCodableInternallyConsistentForXcode(appTransaction)
     }
 
diff --git a/Tests/AppStoreServerLibraryTests/resources/models/appTransaction.json b/Tests/AppStoreServerLibraryTests/resources/models/appTransaction.json
index 8da4400..9299b53 100644
--- a/Tests/AppStoreServerLibraryTests/resources/models/appTransaction.json
+++ b/Tests/AppStoreServerLibraryTests/resources/models/appTransaction.json
@@ -1,5 +1,5 @@
 {
-  "receiptType": "LocalTesting",
+  "environment": "LocalTesting",
   "appAppleId": 531412,
   "bundleId": "com.example",
   "applicationVersion": "1.2.3",