Buckaroo
Background
Buckaroo is a payment service provider, Buckaroo provides a single gateway to several payment methods like PayPal, IDeal and creditcard. My sample application shows a simple implementation of the Buckaroo payment service provider. This technique can also be reused for Ogone "almost identical".
Digital signature
The first step is calculation of the digital signature. This digital signature is used to verify the authenticity of the sender. This hashed string contains several parts of information.