Implement Automated Fuel Dispenser (AFD) preset authorization and delayed capture for unattended gas station terminals

Steps

1. On transaction start, send a preset status-check/hold authorization (commonly up to $175 on Visa) rather than an open-ended amount, since an AFD can't know the final fuel volume upfront.
2. After fuel dispensing completes, send an authorization advice/completion message for the actual pumped amount within the required post-dispense window (about 60 minutes) rather than leaving the preset hold as final.
3. If using a true preauthorization (not just a status check), send the completion or a reversal within about 2 hours of receiving the approval response.
4. Clear/settle the final AFD transaction amount within the network's authorization-to-clearing window (around 2 calendar days for domestic AFD transactions), which is tighter than the multi-day windows allowed for other card-present merchant types.
5. Reverse any unused portion of the preset hold promptly once the actual sale amount is known, to avoid holding excess cardholder funds.
6. Reconcile the original preset-amount authorization against the final captured amount using the network's AFD-specific reporting fields before batch settlement.