How to authenticate your server to my server when a user loads your page in PHP?

user signs up for a key and secret from my site, then they can send/receive from my REST server.

Where I need help is when a user interacts with the REST, how can I determine if they are authenticated using THEIR key and secret? Basicly this will be for a social network site app area. I have seen that many social networks have an app area and use REST and OAuth and sometimes OpenSocial but I have looked at those and they are a bit complex for my needs I think. As for authenticating with OAuth, I guess I do not really understand exactly how it works, maybe it is what I am looking for though? I don't need to authenticate the user who views the page that is running the API, I need the owner of the app's server to authenticate to send back and forth with my REST?

Any advice on how to do this the best way? I would like to do it the best method for future growth, so if I could do it like the big boys do (Facebook, myspcae, hi5, bebo) that would be the way to go I think.

when a request is sent it should pass the key in the URL to my开发者_运维问答 server but they should have there Secret somewhere in there script, I am not clear how to make that work with each other?

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OAuth is almost certainly the best way to go here. Using OAuth, you can provide authorization to almost any kind of web-based API that you would like (REST is fine, but so is plain ol' XML over HTTP).

There are some Stackoverflow articles on how to get started with OAuth.

I also find Google's implementation worth studying, as it's both well documented, and a very good implementation from which to take inspiration. They also have a very helpful "OAuth Playground" that will walk you through an OAuth request step by step.