Can codeigniter be used?

[eluser]Mortred[/eluser]
Can CI be used to handle mission-critical portal that uses sensitive information (connecting to bank APIs, paypal, amazon gateway, etc.)?

I mean, security-wise, I think CI currently have my vote in search for a php framework.. we are currently looking for other frameworks that can be used.

Our proposed project will be heavily focused on e-commerce. Here are some of the features:

1.) Product payments using credit cards
2.) Paypal payments
3.) Bank to bank transactions

Help me out guys, if possible, can you give some tips to beef up the security on CI.

Thanks!