I want to add one new payment method option in the payment method dropdownlist. Is this possible to add using extension components?

I'm afraid i don't have the answer for this one

No worries. Thanks for the quick response

you could use alternative payment methods

Actually, I'm creating one form as same as credit card form. When users enter data it will go to Stripe payment gateway and comes back with payment details. I'm not using netsuite payment methods. Just I want to display a payment method as "Stripe payment" in the existing payment method dropdown using extension api. I have gone through checkout components but there is no method available to bind the value to the existing payment methods.