We need to make a callout to an external system. The external system uses a self-generated certificate to verify the caller. So is it possible to upload a certificate into Salesforce for this purpose?
The only two places I can recall is connected app JWT bearer token and two-way SSL. But since this is a callout to a third party system I don't think either of this should apply. Currently we are uploading it as a document or static resource and read the file as string. But is there a better solution for this?