Hi, I need a simple payment module who generates a unique reference code with the following format: Ex: 497 000 163 Where 497 is fixed id, 0001 is the order id and 63 are two check-digits. The check digits are based on the order total (max value 999 999,99). In this example the order total is 234,67 : 497000100023467 In the uploaded files you can check the algorithm in C# and VB. After the client confirms the order, he should receive an email with the unique reference plus some standard text. If possible I would also like to be able to define a day-limit for each generated reference which would also be included in the order email.