I recently tried buying Flux through Paybis and can say that the service is quite convenient for beginners. You can pay through SPEI, and the interface is simple and understandable even without experience working with crypto exchanges. The purchase process is quick: you enter the amount, confirm the payment, and receive the tokens in your wallet. If you are interested in seeing how it all works, you can check out the
source — there is a description of the steps and purchase details.