Storing HCP credentials

I am using an HCP vault and I can access my secrets from my server by using HCP APIs.
But for accessing it I need to use those following 4 credentials for get a token and secrets (got them from HCP dashboard):
HCP_CLIENT_ID
HCP_CLIENT_SECRET
ORGANIZATION_ID
PROJECT_ID
But how can I store those 4 credentials on my server in a secure manner?