Adding data to a data extension with REST API lead to a 500 error

Ok I have it, and it's less than thrilling. The GUID that is presented isn't the ExactTarget official GUID. Each object (like data extensions), when created in our data base, is given a GUID and a CustomerKey. The ExactTarget auto-generated CustomerKey is NOT A GUID!

So you can get this to work with:

PUT https://www.exacttargetapis.com/hub/v1/dataevents/key:[THE CustomerKey THAT LOOKS LIKE A GUID]/rows/Email:[email protected]?access_token=...

Should work like a charm.