I have API product and want to publish it on the portal created with Pantheon, How can I do this?
This is for the Drupal-based portal.
There are some variations...for example, you can turn off caching of the API Product list (Admin > Config > Dev Portal> Application Settings), so that newly created products appear instantly in the developer portal.
Also you can alter the way the devportal lists the API products, or you can restyle the page that shows the list of APIs, as described here.