This is the serverside of my FYP for college - it enables users to upload their expenses directly from the Point of Sale (POS). It is built using a MERN stack and by leveraging exposed APIs from Xero. Due to time constraints I am emulating the POS, however with authorisation from any cloud-based POS (Shopify, Square, Clover etc.) and the involved merchants this system could be implemented at scale. Alernatively, for non-cloud POS providers, network porting could potentially be an option for accessing transaction data.
Figure 1 - System architecture
Figure 2 - MongoDB database and configuration
Figure 3 - API endpoints
Figure 4 - console.log() output when "Upload to Xero" button is clicked in FYP-Frontend
Feel free to reach out to me @s3anfinnegan on Twitter or Seán Finnegan on LinkedIn if you have any questions related to the project!