Write from facts rather than momentum
Pause long enough to remove accusations, assumptions, and details that belong to someone else. For a message about how to apologize for losing donated funds, use this factual base: state the amount, agreement, transaction, and current shortfall without hiding behind vague language.
Offer a proportionate next step
Match the size of the request to the relationship and to what the recipient can reasonably decide now. Offer a written repayment, correction, or reporting plan with realistic dates and records. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Protect privacy on both sides
Do not ask for trust before the numbers are clear or make a promise that depends on uncertain income. Use qualified financial, legal, banking, or fraud support when ownership or authorization is disputed. Use the most private legitimate channel available and do not share the exchange to recruit support or pressure.