I can open up a page for an app review using the itms-apps:// scheme.
itms-apps://itunes.apple.com/xx/app/id000000000&action=write-review
I have not been able to find a list of possible "action" parameters, other than 'write-review.'
Is there one to show the developer's portfolio?
I would like to direct a customer to my portfolio, but if I use...
https://appstore.com/AbrahamStolk
...as suggested by Apple, then I get an intermediate dialog asking the user if she wants to open the app store, instead of a direct link.
So, it turns out you can do this with itms-apps, but you don't need an action parameter for it. Instead, you build a URL similar to this:
itms-apps://itunes.apple.com/us/developer/abraham-stolk/id303320757
To find your developer id, you can use the iTunes Link Maker.
The use of itms-apps: instead of https: will cause a direct link to the app store, without going through the Safari browser first.