When a guest changes a Booking.com or Expedia booking — a shorter stay, extra nights, a different room — the amount owed changes with it. Amenitiz recalculates the payments on that booking so it is not left overpaid or underpaid.
What happens next depends on who collects the money. If the OTA collects it, Amenitiz records the difference so your accounts match what the OTA actually paid you. If AmenitizPay collects it, Amenitiz also rebuilds the payment schedule on the new booking total.
Before you start
This applies to Booking.com and Expedia bookings only. Other channels and direct bookings keep their existing behaviour.
It applies to modifications the OTA sends before the guest checks in. Changes made once the stay has started are not recalculated — handle those yourself from the booking.
AmenitizPay must be active, and the booking's Sales Terms must have a payment schedule, for payments to be rescheduled.
When the OTA collects the payment
The guest paid Booking.com or Expedia, so the money never moved through AmenitizPay. There is no payment schedule to change — Amenitiz records the difference against the booking so your bills match the OTA payout.
The new total is lower
The OTA refunds the guest directly. Amenitiz logs a refund for the difference against the booking, and cancels any payment still sitting in Scheduled. No money leaves your account — the logged refund is an accounting entry that keeps the booking balanced.
The new total is higher
The OTA collects the extra amount from the guest. Amenitiz logs a payment for the difference against the booking, so the booking shows the full amount the OTA will pay you.
📌 Note
Logged refunds and logged payments do not move money. They record what the OTA has already done, so the booking total, your bills and your reports agree. Read how to refund a payment for the difference between a refund and a logged refund.
When AmenitizPay collects the payment
Here Amenitiz holds the card and owes the guest a correct schedule. It compares what the guest has already paid against the new booking total, then acts on the difference.
Already paid matches the new total
Nothing is owed. Amenitiz cancels every payment still in Scheduled and leaves the booking settled.
Already paid is more than the new total
Amenitiz refunds the difference to the card the guest paid with, and cancels every payment still in Scheduled. The refund reaches the guest's card within 5 to 10 business days.
Already paid is less than the new total
Amenitiz cancels every payment still in Scheduled, works out what is left to collect, and builds a fresh schedule for that amount from the Sales Terms on the booking, using the new stay dates. Anything the guest has already paid counts towards the earliest instalments first, so the guest is never asked twice for the same money.
A guest has paid 650 across two payments. The booking is then extended and the new total is 1,000. The Sales Terms say 40% at booking, 30% ninety days before check-in, 20% one day before check-in, 10% one day before check-out.
The 400 due at booking is already covered. Of the 300 due ninety days before check-in, 250 is covered, so Amenitiz schedules 50. It then schedules 200 for one day before check-in and 100 for one day before check-out, both on the new stay dates.
⚠️ Important
If the new schedule puts an instalment on a date that has already passed, that payment is charged straight away rather than waiting. Extending a booking close to arrival can therefore charge the guest's card the moment the modification comes through.
📌 Note
Cancelling a scheduled payment always emails the guest, and that includes the ones cancelled by the recalculation. If the booking still had several instalments to run, the guest receives one email per cancelled payment before the new schedule appears.
Bookings with more than one bill
When the booking has several bills, Amenitiz fills them in bill-number order, lowest first, until each one is covered — the same order it uses when you reallocate an overpayment to another bill. Refunds are spread across the bills the original payment covered.
Security deposits
Where your Sales Terms set the security deposit as a percentage of the booking, the pre-authorisation amount moves with the new total. A fixed-amount deposit stays as it is. See how to set up automatic pre-authorisations on bookings.
Step by step
You are not notified when a booking is recalculated, so check the booking after a modification comes through to see what the guest has been charged.
Go to
Reservationsand open the modified booking.Click
View booking details.Open the
Paymentstab and read the payment lines. Cancelled instalments show asCancelled, new ones asScheduled, and a refund appears under the payment it came from.Open the
Billstab and check no bill is left with an amount due or anOverpaidbadge.If something does not add up, charge or refund the difference yourself from the
Paymentstab.
Important rules
⚠️ Important
Only Booking.com and Expedia modifications are recalculated. A price you edit yourself on the Bills tab does not move the payment schedule — see how to modify the price of a reservation.
⚠️ Warning
Cancellations are not covered. Cancelling a Booking.com or Expedia booking releases any pre-authorisation but does not refund money already charged. If your cancellation policy entitles the guest to a refund, issue it yourself.
📌 Note
A modification that arrives once the guest has checked in is not recalculated. Charge or refund the difference yourself from the Payments tab.
FAQs
Does this work for Airbnb or my other channels?
Does this work for Airbnb or my other channels?
No. Only Booking.com and Expedia modifications are recalculated. On every other channel, and on direct bookings, you charge or refund the difference yourself after a change.
I changed the price myself — why did nothing happen to the payments?
I changed the price myself — why did nothing happen to the payments?
Recalculation is triggered by the modification the OTA sends, not by an edit you make. When you change a charge or a price on the Bills tab, the booking total updates but the payment schedule stays as it was, so you charge or refund the difference yourself.
Could the guest be charged twice for the same night?
Could the guest be charged twice for the same night?
No. Amenitiz counts everything the guest has already paid before it schedules anything new, and only the shortfall is scheduled. Instalments the guest has already covered are left alone.
Does the refund go back to the guest's card?
Does the refund go back to the guest's card?
Only when AmenitizPay took the payment. Then the money returns to the original card within 5 to 10 business days. When the OTA collected the payment, the OTA refunds the guest and Amenitiz logs the refund so your accounts match — no money leaves your account.
What if the Sales Terms on the booking have no payment schedule?
What if the Sales Terms on the booking have no payment schedule?
Nothing can be rescheduled, because there is no schedule to follow. Collect the difference yourself from the Payments tab, and add a payment schedule to that sales term so future bookings are covered. Read how to set up and schedule payments in AmenitizPay.
A bill still shows Overpaid after a modification — what do I do?
A bill still shows Overpaid after a modification — what do I do?
If another bill on the same reservation still has an amount due, move the extra money onto it instead of refunding — see how to reallocate an overpayment to another bill. If everything else is settled, refund the overpaid amount from the Payments tab.
My guest got payment cancellation emails after changing their booking — why?
My guest got payment cancellation emails after changing their booking — why?
Because every cancelled scheduled payment sends the guest the standard cancellation email, including the ones the recalculation cancels. Nothing has gone wrong: the new instalments appear straight after as Scheduled. If the guest asks, tell them their payment plan was rebuilt for the new dates.