How does OAuth work?

I do not mean how is it implemented, but rather what steps should user pass?

I'm worki开发者_JAVA技巧ng with Photobucket now and I found in its docs that I should generate a new token for every request, because the token can expire in a certain (but secret) period of time.

How does this generation work? Do I need a separate request for generating a token?

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You can have a log in button, and when a user clicks on it you would make an ajax request to get a new oauth access token and then generate the oauth url based on that token.

Then after the user authenticates they will be redirected to a callback URL that you must specify from within your account settings.