Why am I getting the following error?
<ShortMessage>Application name is invalid.</ShortMessage>
<LongMessage>API application "myapplication" invalid</LongMessage>
There are couple of reasons why you can get an invalid application error:
You have not specified the application name correctly. This has to be exactly the same as AppID, which is part of your keys
You are sending your request to the wrong server. Remember, that the Sandbox and Production environments are completely separate and the credentials of one will not work in the other.
Double check your keys and the server url. If you continue getting the error, please file a support request and we can assist you with the issue.