Hello HN<p>I'm one of the developers building Etherparty, a blockchain agnostic platform to create smart contracts.<p>I've been looking to integrate with Stripe or Braintree for payments but I realized that our business model is prohibited on both platforms.<p>This leaves me wondering, are there any payment providers that would work with us?<p>Also, does anyone know what payment processors Coinbase and the like use?<p>Thank you