Send amount and receipt from payee to payer
Process receipt message on payer side
Simplify the Amiko API, by moving an unnecessary call to an internal method
Send OK/NOK from payer to payee, based on user agreement
Added payee message handler
Moved Enum class to new utils source file, for easier re-use by other code
Added payer and payee states
Added confirmation handling on payee side
Added meeting points list to receipt message
Choose meeting point on payer side, and send it back to payee side when the payment is confirmed
Added transaction class, and have instances of it created when a transaction is confirmed by the payer
Added some paylink closing code