Environment: Sandbox
Attempting to make call to the https://connect.squareupsandbox.com/v2/catalog/search-catalog-items endpoint even without any filters is returning a 500 Internal Server Error. I can also replicate this issue via the API Explorer in the Sandbox environment. Production works just fine, though.
Maybe I shouldn’t be working on a Sunday 
There was an issue but the team has since resolved it. Are you able to successfully call the endpoint? 
The endpoint is working again! Thanks for the follow up!
Internal Server Error 500 HTTP status code is very common which means something went wrong on the web server but the server was unable to determine exactly what the problem was.
Opportunities to Resolve
Internal Server 500 Error is a “server-side” error, which means that the problem is not with your PC or internet connection but rather with the website server.
Regards: maria wordfeud
is your issue is resolve or not buddy
@alikhan Are you experiencing an issue with the endpoint? If so could you list the steps to reproduce?