That doesn't work. I tried it with the token, and with quotations around the token.
<Error><Code>1</Code><Description>Authentication failed. Invalid shipping_access_token specified.</Description><Version>1.0.0.40027</Version></Error>

define("SHIPPING_ACCESS_TOKEN","8teceNErAtrev8kubuyesta4utremuH");

I will change the token once I get this figured out.