Initial commit
Issue #4 - Billing: Refactor code to make it more streamlined.

Refactor the code so that it has better legibility.
Throw exceptions instead of if/else statements to interrupt the flow.
Issue #5 - Remove target files from tracked list
Issue #6 - Billing - change order of flow

Using the PayPal docs as reference, changed the order to reflect their suggested flow.
Issue #7 - Billing - Separate the Payment System Response and the verification/transaction into different controllers

Separates the Payment System Response (so far, for PayPal) and the verification/transaction (to add it to the Wepingo database) into different controllers. This way, we can accept many different types of payment services and the system doesn't care.
Issue #7: Forgot to change the info.jsp to the correct URL
Issue #9 - Create Payment Transaction Entity
Finalized Paypal part. Separated response into different controller.
Separated PayPal variables and Wepingo Variables
Fixing bug with value, added 'wrong values' button to test errors
Comment fix
Merging PRShop and ShopDTO
Added the free trial and subscription cancelation functionalities
Changed to French-language Unsubscribe button
Payzen receive call and calculate+compare signature
Payzen Model
Send correct information, receive and confirm response
untracked files on payzen: d8321a1 Send correct information, receive and confirm response
index on payzen: d8321a1 Send correct information, receive and confirm response
WIP on payzen: d8321a1 Send correct information, receive and confirm response