Security of SMS BillPayments

[sec nerd <secn3rd () yahoo com>]

Hi ,

I am doing a security assesment for a banking web
application that are 
introducing a feature of SMS Bill payments.  So a
customer enrolls for 
a 
SMS bill payments online on the website and then
through SMS pays bill 
for various servcies, 
charging his/her credit card.

Has anybody done this kind of assesment before and has
tips or found 
holes.

Any information would be appreciated.

thanks
secnerd

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