Authorize.net测试Webhook出现错误，请求协助排查原因

我在测试Webhook时出现上图所示错误，烦请告知问题原因。同时调用https://apitest.authorize.net/rest/v1/notifications接口获取到通知详情如下：

{
  "notificationId": "92222984-0593-4d3f-815f-c6aa6954525e", 
  "deliveryStatus": "RetryPending", 
  "eventType": "net.authorize.payment.authcapture.created", 
  "eventDate": "2023-08-22T16:03:11.133", 
  "webhookId": "06a407f7-17d2-467e-b6ab-c0e37e79eb79"
}

内容的提问来源于stack exchange，提问作者Sanjana Khan