Okay, so using the format of the cURL example for the MMS JSON API link you sent yields a different error: E104, and complains about the API-Key. Part of my difficulty might be all the slightly different names being given to "keys". I have a Product ID, a Service Plan ID, an API Token, and Access Key ID, and Key Secret. Seems WAY more complicated that other APIs I've used in the past. The link you sent about "contacting account manager" does not take me to anywhere "manager" related. I ended up finding a link for contacting my account manger (a generic email address) under Service APIs -> Configurations. I'll send that email, see what that yields.
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