No checkout would be complete without the option to select a payment. Within the LokiCheckout, payment methods can be added extremely easily, thanks to support for the default Magento architecture, plus a common (Loki-specific) solution for icons and redirects.
At this moment, the following PSPs are supported. This does not mean that other PSPs are unsupported - it simply means that for those other PSPs an integration yet needs to be built (a task that could very between half a day or half a month). Let us know what you need.