Registration
You need to register to be able to call the api. The authentication of the api's free tier is based on domain name (referer header), ensure to enter your domain name correctly (excluding 'http(s)://').
We're sorry, your request was malformed or was unable to be completed for some reason. Try hitting the back button and restarting the process to see if it fixes the problem.
If you want the nerdy explanation, review the following JSON body.
{
"error" : "invalid_request",
"error_description" : "The request is missing a required parameter: redirect_uri",
"error_reason" : "missing_redirect_uri"
}