B2C is just for the consumer so it should be B2B just make sure the payment gateway you are trying to promote or market is secured and since it's new it would be better to market them with the free trial because you need to build trust first with people. Most people right now are smart they only use well-known and open-source payment gateways because we don't know if how safe the closed source payment gateway is than using open-source payment gateway like BTCpayserver.