Adding support for Get App Transaction Info endpoint

Sources/AppStoreServerLibrary/AppStoreServerAPIClient.swift

@@ -310,6 +310,7 @@ public class AppStoreServerAPIClient {
         }
         return await makeRequestWithResponseBody(path: "/inApps/" + version.rawValue + "/history/" + transactionId, method: .GET, queryParameters: queryParams, body: request)
     }
+
     ///Get information about a single transaction for your app.
     ///- Parameter transactionId: The identifier of a transaction that belongs to the customer, and which may be an original transaction identifier.
     ///- Returns: A response that contains signed transaction information for a single transaction.
@@ -452,6 +453,15 @@ public class AppStoreServerAPIClient {
         return await makeRequestWithoutResponseBody(path: "/inApps/v1/messaging/default/" + productId + "/" + locale, method: .DELETE, queryParameters: [:], body: request)
     }
 
+    ///Get a customer's app transaction information for your app.
+    ///- Parameter transactionId: Any originalTransactionId, transactionId or appTransactionId that belongs to the customer for your app.
+    ///- Returns: A response that contains signed app transaction information for a customer.
+    ///[Get App Transaction Info](https://developer.apple.com/documentation/appstoreserverapi/get-app-transaction-info)
+    public func getAppTransactionInfo(transactionId: String) async -> APIResult<AppTransactionInfoResponse> {
+        let request: String? = nil
+        return await makeRequestWithResponseBody(path: "/inApps/v1/transactions/appTransactions/" + transactionId, method: .GET, queryParameters: [:], body: request)
+    }
+
     internal struct AppStoreServerAPIJWT: JWTPayload, Equatable {
         var exp: ExpirationClaim
         var iss: IssuerClaim
@@ -808,6 +818,11 @@ public enum APIError: Int64 {
     ///[TransactionIdNotFoundError](https://developer.apple.com/documentation/appstoreserverapi/transactionidnotfounderror)
     case transactionIdNotFound = 4040010
 
+    ///An error response that indicates an app transaction doesn't exist for the specified customer.
+    ///
+    ///[AppTransactionDoesNotExistError](https://developer.apple.com/documentation/appstoreserverapi/apptransactiondoesnotexisterror)
+    case AppTransactionDoesNotExistError = 4040019
+
     ///An error that indicates the system can't find the image identifier.
     ///
     ///[ImageNotFoundError](https://developer.apple.com/documentation/retentionmessaging/imagenotfounderror)

Sources/AppStoreServerLibrary/Models/AppTransactionInfoResponse.swift

@@ -0,0 +1,16 @@
+// Copyright (c) 2025 Apple Inc. Licensed under MIT License.
+
+ ///A response that contains signed app transaction information for a customer.
+ ///
+ ///[AppTransactionInfoResponse](https://developer.apple.com/documentation/appstoreserverapi/apptransactioninforesponse)
+ public struct AppTransactionInfoResponse: Decodable, Encodable, Hashable, Sendable {
+
+     public init(signedAppTransactionInfo: String? = nil) {
+         self.signedAppTransactionInfo = signedAppTransactionInfo
+     }
+
+     ///A customer’s app transaction information, signed by Apple, in JSON Web Signature (JWS) format.
+     ///
+     ///[JWSAppTransaction](https://developer.apple.com/documentation/appstoreserverapi/jwsapptransaction)
+     public var signedAppTransactionInfo: String?
+ }

Tests/AppStoreServerLibraryTests/AppStoreServerAPIClientTests.swift

@@ -852,6 +852,68 @@ final class AppStoreServerAPIClientTests: XCTestCase {
         }
     }
 
+    public func testGetAppTransactionInfo() async throws {
+         let client = try getClientWithBody("resources/models/appTransactionInfoResponse.json") { request, body in
+             XCTAssertEqual(.GET, request.method)
+             XCTAssertEqual("https://local-testing-base-url/inApps/v1/transactions/appTransactions/1234", request.url)
+             XCTAssertNil(request.body)
+         }
+
+         let response = await client.getAppTransactionInfo(transactionId: "1234")
+
+         guard case .success(let appTransactionInfoResponse) = response else {
+             XCTAssertTrue(false)
+             return
+         }
+         XCTAssertEqual("signed_app_transaction_info_value", appTransactionInfoResponse.signedAppTransactionInfo)
+         TestingUtility.confirmCodableInternallyConsistent(appTransactionInfoResponse)
+     }
+
+     public func testGetAppTransactionInfoInvalidTransactionId() async throws {
+         let body = TestingUtility.readFile("resources/models/invalidTransactionIdError.json")
+         let client = try getAppStoreServerAPIClient(body, .badRequest, nil)
+         let result = await client.getAppTransactionInfo(transactionId: "invalid_id")
+         guard case .failure(let statusCode, let rawApiError, let apiError, let errorMessage, let causedBy) = result else {
+             XCTAssertTrue(false)
+             return
+         }
+         XCTAssertEqual(400, statusCode)
+         XCTAssertEqual(APIError.invalidTransactionId, apiError)
+         XCTAssertEqual(4000006, rawApiError)
+         XCTAssertEqual("Invalid transaction id.", errorMessage)
+         XCTAssertNil(causedBy)
+     }
+
+     public func testGetAppTransactionInfoTransactionIdNotFound() async throws {
+         let body = TestingUtility.readFile("resources/models/transactionIdNotFoundError.json")
+         let client = try getAppStoreServerAPIClient(body, .notFound, nil)
+         let result = await client.getAppTransactionInfo(transactionId: "not_found_id")
+         guard case .failure(let statusCode, let rawApiError, let apiError, let errorMessage, let causedBy) = result else {
+             XCTAssertTrue(false)
+             return
+         }
+         XCTAssertEqual(404, statusCode)
+         XCTAssertEqual(APIError.transactionIdNotFound, apiError)
+         XCTAssertEqual(4040010, rawApiError)
+         XCTAssertEqual("Transaction id not found.", errorMessage)
+         XCTAssertNil(causedBy)
+     }
+
+     public func testGetAppTransactionInfoAppTransactionDoesNotExist() async throws {
+         let body = TestingUtility.readFile("resources/models/appTransactionDoesNotExistError.json")
+         let client = try getAppStoreServerAPIClient(body, .notFound, nil)
+         let result = await client.getAppTransactionInfo(transactionId: "no_app_transaction")
+         guard case .failure(let statusCode, let rawApiError, let apiError, let errorMessage, let causedBy) = result else {
+             XCTAssertTrue(false)
+             return
+         }
+         XCTAssertEqual(404, statusCode)
+         XCTAssertEqual(APIError.AppTransactionDoesNotExistError, apiError)
+         XCTAssertEqual(4040019, rawApiError)
+         XCTAssertEqual("No AppTransaction exists for the customer.", errorMessage)
+         XCTAssertNil(causedBy)
+     }
+
     public func getClientWithBody(_ path: String, _ requestVerifier: @escaping RequestVerifier) throws -> AppStoreServerAPIClient {
         let body = TestingUtility.readFile(path)
         return try getAppStoreServerAPIClient(body, requestVerifier)

Tests/AppStoreServerLibraryTests/resources/models/appTransactionDoesNotExistError.json

@@ -0,0 +1,4 @@
+{
+   "errorCode": 4040019,
+   "errorMessage": "No AppTransaction exists for the customer."
+}

Tests/AppStoreServerLibraryTests/resources/models/appTransactionInfoResponse.json

@@ -0,0 +1,3 @@
+{
+    "signedAppTransactionInfo": "signed_app_transaction_info_value"
+}

Tests/AppStoreServerLibraryTests/resources/models/invalidTransactionIdError.json

@@ -0,0 +1,4 @@
+{
+   "errorCode": 4000006,
+   "errorMessage": "Invalid transaction id."
+}

Tests/AppStoreServerLibraryTests/resources/models/transactionIdNotFoundError.json

@@ -0,0 +1,4 @@
+{
+   "errorCode": 4040010,
+   "errorMessage": "Transaction id not found."
+}