Currently Payments2Us is available with:
Windcave (formally Payment Express) - https://www.windcave.com/
Stripe - https://stripe.com/au
Authorize.Net - https://www.authorize.net/
NAB Transact - https://www.nab.com.au/business/payments-and-merchants/ecommerce-and-online
EziDebit - https://www.ezidebit.com
Global Payments Oceania - https://docs.gpaunz.com/
DataTrans - https://www.datatrans.ch/en/
payFURL - https://payfurl.com/
Blackbaud - https://www.blackbaud.com/
Please see the what are the differences between payment gateway article.
If you have any queries regarding other payment gateways, please email support@payments2us.com