Hi Srinath,

In case you want to apply SSL configuration with a self-signed certificate, you can check following guide that is related to configure APM and SiteScope integration, but since you just require to configure APM SSL side, you can just follow first part:
https://portal.microfocus.com/s/article/KM000003020?language=en_US

Link with document belongs to the following:

https://microfocus.my.salesforce.com/sfc/p/1t000000vhDP/a/8e000000c6PX/SBPTJyMuK6ExYdZopVrYmqjeybZ9Zdt1sUg4shYl13U 

In case you require to implement SSL in APM with a CA certificate, please follow this guide:

https://support.microfocus.com/kb/kmdoc.php?id=KM1135982&fileName=Enabling%20SSL%20in%20Apache%20-%20BSM%209_x.pdf

Based on BPM side, if you implement hardening to BPM, you will need to follow this documentation:
https://docs.microfocus.com/doc/Business_Process_Monitor/9.53/ConfigBPMforSecureConn#How_to_Configure_SSL_Support_for_BPM_Admin

It is very important to make sure that APM Gateway Server URL for Data Collectors that can be found over following path:

APM GUI -> admin -> Platform -> Infrastructure Settings
Foundations: Platform Administration

Host Configuration -> Default Virtual Gateway Server for Data Collectors URL 

Is configured over BPM instance in BPM Console correctly.

As well, it is important to exchange certificates between APM JRE/JRE64 cacerts and BPM JRE cacerts:

Command to import APM certificate in BPM will be the following: 

C:\MF\BPM\JRE\bin\keytool -import -trustcacerts -alias <your server> -keystore <truststore path> -file <path to certificate>


Note: The default truststore path is: <BPM installation directory>\MF\BPM\JRE\lib\security\cacerts

Note: Password from cacerts truststore belongs to changeit

Command to import BPM certificate in APM truststores will be the following:
C:\HPBSM\JRE\bin\keytool -import -trustcacerts -alias <your server> -keystore <truststore path> -file <path to certificate>

Note: The default truststore path are <APM installation directory>\\JRE\lib\security\cacerts and <APM installation directory>\\JRE64\lib\security\cacerts 

Note: Password from cacerts truststore belongs to changeit

You will need to import BPM certificate in both Truststores.

After importing certificates, restart APM and BPM services.