javascript - Accessing Facebook Graph API from unknown domains -

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i'm working on app lets users place widgets on websites visitors can optin email addresses (kinda similar leadpages).

now i'd implement facebook optins i'm having difficulties figuring out elegant solution allow access fb app unknown domains, users can authorize app , can use graph api names , email addresses.

what kind of approach suggest? currently, i'm handling opening new popup domain's url redirects users fb login page app , handle else in popup looks awful because whole facebook.com seen, not login part in js sdk.

thanks!


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