I don't think there's such a hybrid all-in-one system because of the additional requirements and complications associated with receiving fiat. I think you would have to create your own system, possibly leveraging an existing Bitcoin payment system, combined with a fiat system, and integrate it into ...

could be https://opennode.com ?

Wordpress ecommerce + btcpayserver + stripe plugins?

What am I doing here? 😅

www.lightningpay.nz for those in New Zealand.

Very difficult to offer direct fiat-to-BTC conversions due to inherent chargeback risks. However, for US based merchants, orqestra.io is a great option for setting purchases on auto-pilot based on sales volume. We have an integration at Zaprite. Here's an overview of how it works: https://blog.zapr...