A typical Point of Sale System is an inventory control program with the ability to generate a sales invoice, customized for each merchant's specific situation. It does not function as a Payment Processor to 'settle' or pay the generated Invoice.
Settling the Invoice is the job of a separate Payment Processing System. This could be as simple as a cash drawer attached to a computer or an integrated cash register that settles the transaction with cash. For 99% of most transactions, they are settled using a bank's Merchant Terminal to process a CC and settle the invoice with Credit.
Payment Processing is separate from Point of Sale, but they can have hooks into each other (POS sends PPS the invoice and amt, PPS sends POS confirmation of payment to settle Invoice). The Epic PPS allows the merchant to manually generate the parts required for Epic wallet to settle the transaction with Epic and would also require a manual query of the wallet to verify the amount was received and then mark the Invoice in the POS as 'settled/paid'.
The required parts (Epic address, Invoice # or Transaction Description, Amount) can be generated from a merchant's POS system with minor coding and present the info as a QRcode for the Epic Pay Wallet to scan and process (like https://epipay.epic.tech but fully automated). More POS code would be needed to query the Epic wallet to confirm the transaction amount was received in order to settle the Invoice and mark as paid.
For Epic Pay, the following steps are required to process a payment:
- Scan QRcode (from Merchant 'Terminal' - tablet or PC in person) or online checkout.
- Parse string into 3 data elements by delimeter (*) : Epic Receive address * Invoice Number or Transaction Description * Amount
- Calculate fiat currency value of amount and append to Invoice for On-Chain Memo
- Jump to Send page
- Autofill the Send Address, On-Chain Memo, Amount
- User verifies info on Send page then taps Send to make Payment
You use a browser to access the epipay QRcode generator. It is configured to accept the following URL formats:
https://epipay.epic.tech - allows manual entry of receive address, invoice/memo, and amount. These values will reset after you generate the QRcode.
https://epipay.epic.tech?receive_address - use this form of URL with a query string and it will make your receive address persistent between code generations. This is good for merchants to have running on a spare phone or tablet at checkout so all they have to do between transactions is update the invoice and amount without re-entering the receive address.
https://epipay.epic.tech?receive_address*inv/memo*amount - this will populate all data fields from the URL delimited with '*' and all will be persistent. To reset, just use https://epipay.epic.tech.
Note: The amount field should bring up the Numeric Keypad on mobiles.
Merchant would provide not only a QRcode for EP but also the same data string as a 'Payment Request' on their Checkout screen that can be copied from the website and pasted into a Pay screen on GUI that follows the same processing steps as EP with an additional first step to paste the Payment Request string into an input field with a 'Process' button next to it. GUI could then stay on Pay screen to review processed data and verify amount then Send via a Pay Button or could jump to the standard Send screen with data autofilled (to be determined).