Hey Wei,
DFA7 should be called by its proper name, DDMM (DoubleClick Digital Marketing Manager). DDMM is an upcoming enhancement to DFA. Everyone's accounts will eventually be migrated over from DFA to DDMM. When this upgrade occurs, there will be a new UI but we have taken steps to make the API as similar as possible. There are some changes customers will have to be aware of - for example, in the DDMM API, your tokens returned from the login service's authenticate method will expire after a set amount of time, currently 24 hours - but overall very little is changing and your applications should migrate almost effortlessly.
Both current versions of the DFA API, v1.19 and v1.20, will continue to work once your account is upgraded to DDMM. The API will still be accessible from the same URLs.
Cheers,
- Joseph DiLallo, the DFA API Team