Stripe: Help with the right input variables/object

An Object on the client side was created by the Stripe.js createPaymentMethod trigger. [object Object] is sitting in a textarea named ‘paymtmeth’. I want to pass the whole structured object or just its ID over to server via form (then save ID to db).

How do I structure my input for collecting either the whole Object or just the payment_method ID?

I would appreciate both input methods for my learning… and for the community as I could not see a similar use case in previous posts.
Thanks folks.