PMPOS

Poor man's Point of Sale terminal

Submitted for the Solana DeFi Hackathon March 1 2021

Demo videos

If you want to see the demo of this simulated back-end for the merchant's Point of Sale system as well as the consumer wallet app please visit:

• Demo of consumer wallet

• Demo of merchant Point-of-Sale back-end

Installation

go get "github.com/gorilla/websocket"

go get "github.com/tidwall/gjson"

Running

go run pmpos.go

What it does

This application simulates the back-end of a merchant's Point of Sale (PoS) system. It performs two basic functions:

1. Keeps a tab on the merchant's USDC balance of a soft wallet held on Circle.com. It accomplishes this by polling the Circle Wallet API periodically
2. Connects to the Solana testnet WebSocket and submits a request to be notified of all changes to an address on the Solana chain to which a customer pays the merchant in USDC

This server should be running while the other component of this hackathon, the Circle-Solana Customer Wallet simulates a checkout flow at the merchant's PoS.

Due to the rapid settlement time of Solana, the merchant is assured that the transfer transaction has completed and it is safe to provide the customer with the goods or services he just paid for.