Adyen payment gateway integration

Hi, Adyen ([login to view URL]) is a payment gateway supporting credits cards and mobile payment with relatively easy-to-use APIs. We have a web service for which we would need a payment functionality using Adyen service. The service is not complicated webstore, but just a simple service where payment is fixed (e.g. 5 euros) and then customer has to pay it (right away) either using SMS payment or credit card. The payment module has to save tranactions to simple database.