AX 2012 R2 Commerce data exchange certificate expired

Hi folks,

We are getting an issue while confirming the customer order from any of the POS’s installed as ‘Cannot save the order at this time’.

On digging down deep, I found that our default certificate for commerce data exchange has been expired. I’ve tried to create and use self signed certificate for an instance, but didn’t got any success.

Followed the below URL for that:

Can anyone explain the process to replace the existing certificate and what are the steps to be taken care at server side and on the POS machine? And if any services/POS need to be restarted after placing certificates and before starting POS transaction again?

Also, how would i get trusted certificate and from which source?