Implement incremental authorization for hotel reservations to capture additional charges at checkout

Steps

1. At booking time, create an initial authorization for the estimated stay cost; set the authorization to capture manually rather than automatically.
2. Store the original authorization identifier from the payment network response for use in subsequent incremental auth requests.
3. When the total increases (e.g., extended stay, minibar charges), submit an incremental authorization request referencing the original authorization ID and the additional amount; the total authorized amount becomes the sum.
4. At checkout, capture the final amount up to the total authorized across all incremental auths; send the capture request with the final settlement amount.
5. If the guest cancels or checks out early, void the authorization within the required void window to release the hold on the cardholder's account.
6. Ensure your gateway supports incremental authorizations and passes the incremental indicator in the network message; not all gateways support this capability.