Background:
① We initiate push notification requests by generating tokens using the p8 certificate.
② The lowest version of the server we use is Ubuntu 16.04, and the image is Alpine Linux 3.15.
③ Currently, the root certificate USERTrust_RSA_Certification_Authority.pem is default in the system and has the same MD5 value as the provided download file. The time for both is 2019.
My questions:
① Which certificate should we download and add to the server's trust store, Root Certificates?
② Does the system we are using default include this certificate?
③ What operations are needed for this server certificate replacement?