Retrieve Information of the Customer

[boldtrn]

Hi Johannes,

as discussed earlier, I added the Information of the Customer to the extendedData.

A thing to talk would be why I returned the Data as array and not as ParameterBag as it is definied in the Response Object. I personally like to handle with Arrays in the Controller. But that also could be changed.

[iamdto]

@schmittjoh What about this PR ? I find it very usefull.

[schmittjoh]

In general, we can add it, but this PR has CS problems and also no tests.

[iamdto]

Thanks for your answer. I'll fork the repo to match my own requirements as I need it quickly.