I connected with VPN to setup the inventory API to get product list and it works fine. Once I get the result from the web-service and i bind to UI. And also I integrated Pay
SSLHandshakeException can be resolved 2 ways.
Incorporating SSL
Get the SSL (by asking the source system administrator, can also be downloaded by openssl command, or any browsers downloads the certificates)
Add the certificate into truststore (cacerts) located at JRE/lib/security
provide the truststore location in vm arguments as "-Djavax.net.ssl.trustStore="
Ignoring SSL
For this #2, please visit my other answer on another stackoverflow website: How to ingore SSL verification Ignore SSL Certificate Errors with Java