A payment gateway is the equivalent of a credit card processing machine, it is your portal to accepting online payments (everything from card payments to direct debit payments to payments via online wallets).
Omnibasis supports a host of payment gateways with which you can get an account and start processing payments.
When you have a payment gateway (and a merchant account, depending on which payment gateway you decide to use) in place, the next step would be configuring your payment gateway in Omnibasis.
Omnibasis support as many payment gateways as you need for your business. Each Payment Gateway is associated with a currency.
Note: if you want to accept payments in one or more currencies, please make sure those currencies are defined before your create new Payment Gateway. Learn more about Currencies support on Omnibasis.