The link above goes over this pretty well, has this been integrated? Key/secret with RSA-256 validation would be fine too. I ask, as this is pretty common. Most of the 3rd party services I have to integrate use this type of security. Same with AWS, Twilio, etc. and any service that would be expected to integrate to our API would likely expect this rather than user/pw login and then using token responses from that. That said, tokens obviously works good too. There are some good benefits as to why using the key/secret hmac though.
Thankfully, I saw the example someone had given, which is good, though I figured I'd ask in case someone else has done this, and if so, if they have a full example on this? The one he gives certainly goes over most of it, but would be a lot easier to see in the full example in a aspnetzero and/or aspnetboilerplate. It also is prudent to ask as if so, it would save me some time
Thanks in advance for any responses!