title: iOS APNs response error with 403 "BadCertificate"
body: <p>when our push certification will expire, we apply a new certification, but when we use .pem to connect server, we receive error like &quot;{&quot;reason&quot;:&quot;BadCertificate&quot;}&quot;</p>
  <p><a href="https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/handling_notification_responses_from_apns?language=objc#3394526" rel="nofollow noreferrer">https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/handling_notification_responses_from_apns?language=objc#3394526</a></p>
  <p>In above document, we can find this Error string in 403 Status code, but there is no way to solve the problem</p>
  <p>we really need some advise to solve this problem, thanks</p>