Adding awareness of redirection to the pinger class
Payment model added for dealing with sending handshake
Changed strategy of retrieving paymet methods for easier access
Formatting handshake request fited to new payment methods structure
Minor specs refactorization
Model for stubing Cart in the payment processing
Routing changes for dealing with new naming convention
Global controllers method with Cart stub to dealing with current chosen cart
Redirection source delegating in the Payments#create
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