Push notification to own openhabcloud

Tags: #<Tag:0x00007f616d46f7f0> #<Tag:0x00007f616d46f728> #<Tag:0x00007f616d46f5c0>

I have own openhabcloud, have developer account in Apple, have domain with ssl. How can I configurate push notifications to IOS? I create sertificate.pem But in config it is a two files cert and key? What my mistake?