SSL for Coturn server and Kurento

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Dear All,
I had installed OM some time ago, and configured SSL for Coturn server and KMS. The certifications for these servers apparently need to be renewed. I checked the installation guide but it doesn't show how. I think I created the certificates and keys based on explanation from someone in your team by then, but I don't have a documentation for this.
If there is a document that you can refer me to for this purpose please share. Otherwise please tell me the steps so that I can keep record of them for renewal again in the future.
Thank you.