Pull up the order
Find the sale and the fees charged before you reply.
Show the breakdown
List each fee with its amount and what it covers.
Point to the rule
Link the fee schedule so they can check it themselves.
Correct real mistakes
If a fee was wrong, refund it and say when it will show.
Explain how to lower fees
Mention anything that reduces fees, such as plan or volume tiers, if you offer it.
Keep the schedule current
Update your fee page whenever fees change so replies stay true.