Hi shak-t,
There is a Portalman service (the Portal reaches out to the Gateway and calls the Portalman service) that helps sync all the APIs and API Plans and such between Gateway & Portal. I believe this syncs every 5 minutes by default.
Typically this will trigger when a service is created using the "Set as Portal Managed Service" assertion. However, it is possible (I will need to test this) that it isn't triggered when using the Restman interface, meaning it would wait for the next sync to run roughly 5 minutes later.
Sincerely,
Dustin Dauncey
Sr Support Engineer, Global Customer Success
Email: Dustin.Dauncey@ca.com
Phone: +1 800 225 5224 ,48385
Phone if outside North America - https://tinyurl.com/CAContactSupport
CA API Management Community: https://tinyurl.com/CAAPIMCommunity