AcmeBrands, how may I help you?
My credit cards keeps saying it's invalid on your website.
Let me help you with that.

Could you try to enter your credit card information again?
I  tried it, it didn't work.
Ok

Can you log out of your account and then log back in and try again?
Thanks, It just worked.
That is great. Can I help you with anything else?
no
Have a good day.