From the help–
Whata€?s an Access Point? and whata€?s my Blog ID?
a€?Access Pointa€?, a€?Blog IDa€?, and a€?Platforma€? are three absolutely vital pieces of information Photon uses to communicate with your blogging software. a€?Platforma€? in itself is not a difficult question to answer; it should be quite well known to you whether you use Movable Typea?¢ or TypePada?¢ to power your weblog, though the other two may pose some difficulty.
Movable Type users:
Your bloga€?s access point is the location of its XML-RPC server, found in your Movable Type installation directory with the name mt-xmlrpc.cgi. For example: https://www.example.com/mt/mt-xmlrpc.cgi
Your blog ID can be printed into any template using the template tag <$MTBlogID$>, and can alternately be found in the location bar of your browser while youa€?re logged in to Movable Type. For example: https://www.example.com/mt/mt.cgi?__mode=menu&blog_id=2
… does anyone know this for WordPress?