Credit

Credits(₵) are the primary currency used in The Warren. It is a virtual currency exchanged over an intranet system managed by the many banks in The Warren. These banks run a system designed for the management of currency alone in order to have a dedicated flow of data traffic preventing the internet used within the city from being bogged down with constant data use. 
Credits are stored on a nano-card injected into peoples palms to make payments by simply holding their hand over payment receiving panels, but credits are able to be distributed by storing them on recyclable one-use credit cards for those who are incompatible with nano-technology due to health reasons.
Reigels can be exchanged for credits, the exchange rate is poor but reigels cannot be used in the city to purchase goods so there is little option but to convert reigels into credits. Likewise credits are useless outside of The Warren as no other settlement on Faria has the means to accept or exchange them properly, so credits cannot be converted into reigels at all outside of The Warren.
Credits function similarly to paper money but is counted in flat numbers without any decimal places to denote amounts under 100. A single credit equals ₵1 but the cost of goods and services falls within some average ranges depending on where one shops. To buy a cup of instant noodles would cost ₵50, cheap beer would cost ₵100 per pint, a freshly prepared bowl of noodles at a noodle bar would cost ₵150, a subway ride costs ₵300, a taxi ride costs ₵800, entry fees to museums or attractions can cost between ₵400-₵1500 per person and a meal at a restaurant can cost ₵3000.