I personally think it is a good idea to use AI for that. Really good idea. I just can't know if it works and if your process is good enough, so I'm not paying (but I don't have any money either, so I'm not your target potential customer).
I was really concerned when I saw this (I thought you were asking them to not use Stripe or PayPal), but I strongly concur. Using Typeform for collecting credit cards is an extreme violation of PCI-DSS.
You need to pull down your site immediately and don't put it back up until you aren't running cards through Typeform.
I am normally very loose with rules and I know validating is hard, but you are exposing yourself to major financial implications by doing this.
EDIT: Spoke too soon. Looks like they are properly exchanging info for a token and not passing info to Typeform, just the token.
Some more information about your process would help - because it sounds interested as a service but leaves a lot of questions unanswered.
Not saying anything dodgy is going on, but it doesn't make for the best first impression.