Oh, must have written past each other.
I just did this yesterday, to create a seller i use Stripe.Js 2.0 plugin from Copilot. Here you can create a button with the following actions:

  1. Button A is clicked → Stripe.js - Account (Seller, All) - Create

EDIT: Remember to fill in your API keys in the plugin settings, delevopment for test area and production for live version.