I'm tring to Send Notification using cURL Command for that i used curl commad curl -v \ --cert "${CERTIFICATE_FILE_NAME}" \ --cert-type DER \ --key "${CERTIFICATE_KEY_FILE_NAME}" \ --key-type PEM \ --header "apns-topic: xobuya" \ --header "apns-push-type: alert" \ --header "apns-priority: 5" \ --header "apns-expiration: 0" \ --data '{"aps":{"alert":{"title":"title","subtitle":"subtitle","body":"body"}}}' \ --http2 https://api.push.apple.com:443/3/device/my-id I have a also run this in order to get .pem openssl x509 -inform DER -in aps.cer -out aps.pem but i got error like this ` * Connected to api.push.apple.com (17.188.180.206) port 443 schannel: disabled automatic use of client certificate schannel: certificate format compatibility error for aps.cer 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 Closing connection curl: (58) schannel: certificate format compatibility error for aps.cer`