Can you provide a bit more detail about what you are wanting to do? i.e. Take a payment when someone registers for an event?
The way it would be integrated would largely depend upon that.
There are some third party companies that offer easy API integrations How to link Marketo with Stripe (Integrations) - Zapier
I agree you would need more info and to get a developer or discuss Stripe's API with them.
Marketo is not PCI compliant, so you shouldn't use this to pass payment or certain info into Marketo. Be very careful how you setup this integration.