PA-DSS for Payment App?

Hi.

I just want to get opinion how WG members think
should payment app of browser default installed be compliant for PA-DSS?

I know this is not part of WG standard issue.
But considering wide adaption of web payment at real industries,
I think PA-DSS is necessary for Payment App of Browser inside. (PCIDSS for
web based payment app)
at least payment app is storing credit card information.

regards
mountie