diff --git a/Sources/Services/Feishu/FeishuAuthService.swift b/Sources/Services/Feishu/FeishuAuthService.swift
index 3e1cb77..80aeb4d 100644
--- a/Sources/Services/Feishu/FeishuAuthService.swift
+++ b/Sources/Services/Feishu/FeishuAuthService.swift
@@ -51,9 +51,9 @@ final class FeishuAuthService {
         request.httpBody = try JSONEncoder().encode([
             "grant_type": "authorization_code",
             "code": code,
-            "redirect_uri": redirectURI,
         ] as [String: String])
-        return try await decodeAPIResponse(request)
+        // Token endpoints return data at top level, not wrapped in {code, msg, data}
+        return try await send(request)
     }
 
     func refreshAccessToken(_ refreshToken: String) async throws -> OAuthTokenData {
@@ -65,9 +65,10 @@ final class FeishuAuthService {
         request.setValue("Bearer \(tenantToken)", forHTTPHeaderField: "Authorization")
         request.httpBody = try JSONEncoder().encode([
             "grant_type": "refresh_token",
-            "refresh_token": refreshToken
-        ])
-        return try await decodeAPIResponse(request)
+            "refresh_token": refreshToken,
+        ] as [String: String])
+        // Token endpoints return data at top level, not wrapped in {code, msg, data}
+        return try await send(request)
     }
 
     func fetchCurrentUserName(accessToken: String) async throws -> String {
@@ -112,14 +113,6 @@ final class FeishuAuthService {
         return data.tenantAccessToken
     }
 
-    private func decodeAPIResponse<T: Decodable>(_ request: URLRequest) async throws -> T {
-        let response: FeishuAPIResponse<T> = try await send(request)
-        guard response.code == 0, let data = response.data else {
-            throw FeishuError.apiError(code: response.code, message: response.msg)
-        }
-        return data
-    }
-
     private func send<T: Decodable>(_ request: URLRequest) async throws -> T {
         let (data, response) = try await session.data(for: request)
         guard let httpResponse = response as? HTTPURLResponse else {