array in a store procedure in C

Hi, i m developing a store procedure that accepts an array of rows, this is
the simplified code:

http://pastebin.com/wC92Dh7f

Please note that i left out everything that is not related, in the
function, to the problem at hand, only the code related to my problem is
included.

The above does not allow me to access the members of the rows in the array,
this is how i call this function:

select ret,username,password from
wtt_add_account('2802021','JPL123','1','3',ARRAY[row('1','25','10')::wtt_balance_info_t,row('2','50','15')::wtt_balance_info_t]);

The type wtt_balance_info_t is:

CREATE TYPE wtt_balance_info_t AS (balanceid varchar(25),chgval
varchar(25),servicestop varchar(25)) .

I would really appreciate if someone could give me guidelines how to
read/extract the rows from the array and then get each element from the
rows. thank you very much!!