I tried to do an app from your "Looking Up Social Datan with FullContact API" tutorial and faced problem while in testing the service. I followed the exact procedure by providing the same URL and request (like email and apikey) but it showed "Test failed! Please check service properties and the error details in "Response" area." Can you pls give me a solution? 
Hello,
Please check you email and API key. Are they correct?
Yes they are correct. It works fine in case of giving just one request. I get that error when I give more than one request.
Try to use "Use Appery Proxy" on service setting tab if you are using "json" data type.
I tried that. Still I get the same error.
Can you share you key privately with us (via a href="mailto:support@appery.io" rel="nofollow"support@appery.io/a)?
I have mailed it to that ID with apikey as subject.
I checked with your api key. Сould get response only with the post method.
Try to use post method on service setting tab.
I tried using post method and even that is not working
Can you share you project with a href="mailto:support@appery.io" rel="nofollow"support@appery.io/a ?