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Some APIs (I know of at least twitter) allow the calling app to specify the callback URL, that will be used. This is very useful for development where the app URL may not match the settings in the twitter account. The node-oauth package supports this parameter and it works well with twitter, but I didn't see a way to pass that through with everyauth (or in turn mongoose-auth). I haven't dug into the code to see if this works, but isn't documented, or if it's not implemented at all, but it would be a nice feature to have (and document).
This is supported and was not documented. Committing some new documentation now in order to close this issue.
Added documentation for over-riding Twitter's callback URL. Closes GH-29