diff --git a/backend/services/auth-service/src/infrastructure/alipay/alipay.provider.ts b/backend/services/auth-service/src/infrastructure/alipay/alipay.provider.ts
index 55fc5f1..61407f3 100644
--- a/backend/services/auth-service/src/infrastructure/alipay/alipay.provider.ts
+++ b/backend/services/auth-service/src/infrastructure/alipay/alipay.provider.ts
@@ -101,17 +101,17 @@ export class AlipayProvider {
       code: authCode,
     });
 
-    const resp = result['alipay_system_oauth_token_response'];
+    const resp = result['alipay_system_oauth_token_response'] as Record<string, unknown> | undefined;
     if (!resp || result['error_response']) {
-      const err = result['error_response'] || {};
+      const err = (result['error_response'] || {}) as Record<string, unknown>;
       this.logger.error(`Alipay token exchange failed: ${JSON.stringify(err)}`);
       throw new BadRequestException(
-        `支付宝授权失败: ${err.sub_msg || err.msg || '未知错误'} (code: ${err.code || '?'})`,
+        `支付宝授权失败: ${err['sub_msg'] || err['msg'] || '未知错误'} (code: ${err['code'] || '?'})`,
       );
     }
 
-    this.logger.log(`Alipay token exchanged: userId=${resp.user_id}`);
-    return resp as AlipayTokenResponse;
+    this.logger.log(`Alipay token exchanged: userId=${resp['user_id']}`);
+    return resp as unknown as AlipayTokenResponse;
   }
 
   /**
@@ -126,16 +126,16 @@ export class AlipayProvider {
       accessToken,
     );
 
-    const resp = result['alipay_user_info_share_response'];
-    if (!resp || result['error_response'] || resp.code !== '10000') {
-      const err = result['error_response'] || resp || {};
+    const resp = result['alipay_user_info_share_response'] as Record<string, unknown> | undefined;
+    if (!resp || result['error_response'] || resp['code'] !== '10000') {
+      const err = (result['error_response'] || resp || {}) as Record<string, unknown>;
       this.logger.error(`Alipay userinfo failed: ${JSON.stringify(err)}`);
       throw new BadRequestException(
-        `获取支付宝用户信息失败: ${err.sub_msg || err.msg || '请确认已开通「获取会员信息」接口权限'}`,
+        `获取支付宝用户信息失败: ${err['sub_msg'] || err['msg'] || '请确认已开通「获取会员信息」接口权限'}`,
       );
     }
 
-    return resp as AlipayUserInfo;
+    return resp as unknown as AlipayUserInfo;
   }
 
   /**