Milan / Paylink System Manual Issue 1.5 29 January 2020
CONFIDENTIAL
Not to be disclosed without prior written permission from Aardvark Embedded Solutions Ltd
Page 35 of 71
Extended Escrow (1.12.6)
Introduction
The original design of the Paylink API pre-dates the arrival of note recyclers; at the time that Paylink
was produced coin escrow was handled by “external” equipment controlled by a simple output driving
a solenoid.
The Escrow facility implemented in all Note acceptors provides a way of double checking that a note
is acceptable before it is accepted, but does not provide a proper generalised escrow facility as:
o There is a significant delay between accepting the escrow note and knowing that it will
remain inaccessible to the user
o It only provides escrow for a single note
Paylink now provides an ExtendedEscrow API which, when used in conjunction with a suitable note
recycler, meets the following objectives:
o Up to 32 notes can be handled
o The application remains in total control of the Escrow process
o Once a note is in the extended escrow system it is only returned to a user under application
control
o If escrowed notes are returned to a user, only those note supplied by the user are returned
automatically.
o Where escrowed notes match note recycler dispensers, the notes are tracked and directed to
those dispensers.
o If an application has normal Escrow turned on, it can control the entry of notes into the
extended escrow system.
o A note recycler with an extended escrow dispenser defined cannot be enabled using the
normal control facilities (As the notes will go to the extended escrow dispenser from where
they will unrecoverable.) Note that individual notes can still be enabled and disabled.
Under abnormal conditions, the application decides on the appropriate action, rather than Paylink
automatically. Such conditions include:
o System start-up where an escrow operation was in progress.
o Notes “accidentally” directed to the cashbox rather than a recycler.
Functionality
A note recycler is regard by Paylink as being made up of an Acceptor and a number of recycling
units.
In general, these recycling units will have been published by Paylink as Dispensers and can be used
to make payouts to users.
The pre-requisite for Extended Escrow is that the note recycler has at least one recycling unit that will
accept every denomination of note and that has ability to either transfer these notes to the acceptors
stacker, or to return them to the user. This is called the escrow recycling unit in this document.
The essential feature of the Paylink Extended Escrow system is that notes are initially accepted into a
logical escrow, with the Paylink unit keeping track of which notes have been inserted and where they
are being stored.
The application, which uses the Paylink escrow facilities to control and monitor this, can then decide
to either stack (keep) the notes, or can decide to return the notes to the user.
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