Billie support

[LinusU]

Is your feature request related to a problem? Please describe. We're trying to integrate Billie using the "Direct API" integration in our iOS/Android React Native app.

Describe the solution you'd like I would love for this to work the same way as Klarna does, e.g:

const result = await confirmPayment(clientSecret, {
  paymentMethodType: 'Billie',
  paymentMethodData: {
    billingDetails: {
      address: { country },
      email
    }
  }
})

Describe alternatives you've considered Our alternative at the moment is integrating directly with Billie outside of Stripe, or using Svea which provides a similar service in our region.

Additional context I'm open to creating a pull request to get this moving. We have been stuck in a long process trying to get B2B invoicing delivered to our customer, and this is a high priority for us.