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0 pointstraceroute663y ago0 comments

> Most credit or debit cards support offline transactions, so a shop can keep a battery powered terminal that reconciles when it comes online.

Almost....

Its been a while since I have been involved in POS payments, but IIRC there is a clear protocol which goes something like this:

     1. If the card machine is online and working, use that
     2. If the card machine is not working *AND* the business is willing to take on the risk, record an offline transaction for later reconciliation
     3. If the card machine is not working *AND* the business *IS NOT* willing to take on the risk, call bank $phone_number for manual transaction validation and record the validation code provided at the end of the call.

0 comments

anticensor3y ago

4. If the card machine is not working and your business requires automated immediate finalisation of payment, refuse all cards altogether

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0 pointstraceroute663y ago0 comments

> Most credit or debit cards support offline transactions, so a shop can keep a battery powered terminal that reconciles when it comes online.

Almost....

Its been a while since I have been involved in POS payments, but IIRC there is a clear protocol which goes something like this:

     1. If the card machine is online and working, use that
     2. If the card machine is not working *AND* the business is willing to take on the risk, record an offline transaction for later reconciliation
     3. If the card machine is not working *AND* the business *IS NOT* willing to take on the risk, call bank $phone_number for manual transaction validation and record the validation code provided at the end of the call.