Multiple Payment Gateways / Merchant IDs

We would like the ability to have different payment gateways or the ability to amend the gateway on different websites. We operate 2 companies in a business hub, and have two different merchant accounts to receive payments.

Website 1 to business 1

Website 2 to business 2

Also allow the ability to have one website on the live payment gateway another on test. This would allow full demos to potential affiliates.

Currently the is one single current payment gateway for all sites that must be in live or test for all. Multi company payment reconciliation is difficult for multiple company users.