Push notification IOS Ionic 3

Hi there,

I am stack in generating IPA file in development mode for my App , I don’t understand the process used to merge the certificates generated ( ios development and APNs Development iOS ).

I am using IONIC pro to generate IPA file. And I am using Ubuntu with openssl to generate pem and p12, I don’t understand why it’s not working, I will need any help to understant more clearly the steps taken to generate push certificate and ios app certificates,and in which momen I can use files like push.p12 or something like that.

I need this missing piece in this puzzle , Any provided docs or example that describe every step to integrate push notification with openssl will be appreciated.

HELP !