StuStaPay
Electronic Payment System for Festivals, developed for StuStaCulum
Use NFC wristbands to quickly pay at events!
Idea
- Free software digital payment system for festivals
- Every user has a NFC chip (in their wristband)
- Users can top up their credit via Cash, card or online payment services
- They can buy products at points of sales, where their credits are deduced
- Designed to comply with German fiscal laws (digital signatures with TSE)
Documentation
Components
Core
All transactions go through the core.
Database
The database ensures transaction-safe handling of the payment processing logic. It's the source of truth for account funds, order processing and offered products.
Core Server
Python tool which handles PoS requests over websocket.
TSE signatures
All transactions need to be signed by a federally approved security module (as defined by Kassensicherungsverordnung - KassenSichV)
App
- Operated at points of sale
- Is connected via HTTP calls to StuStaPay core
- Registers customer's orders
- Can scan and validate NFC tags
Webapps
Each one runs on separate Python webserver, which talks to the core database.
Administration site
Configuration of products, cash desks, accounts, ...
User Self Service Portal
- Top up account with online payment
- Get payment receipts
- Pay back money after the event
Tech stack
Core
- Python
- PostgreSQL DB
- asyncpg
- FastAPI
- uvicorn
TSE integration
- TSE hardware module
Ordering Terminal
- Android telephone with NFC reader
- Kotlin
- jetpack compose
Webapps for Management and User Self-Service
- react
- nodejs
License
Released under the GNU Affero General Public License version 3 or later, see authors and license for details.