How do I correct a receipt that was already sent?

You do not edit the receipt: you edit the payment, and a corrected receipt goes out by itself. Only the owner can edit a payment.

1. Student profile, Payments card, Edit next to the payment (or Edit last payment in Fees).
2. Correct the amount, date or method, then save.
3. A corrected receipt is sent with the same number and the line "Corrected receipt — replaces the receipt of …". It is sent even if automatic sending is off.

Rules: a change to the note alone sends nothing. If the payment never had a receipt, nothing is corrected. If the problem is the student's name, the subscription type or the school address, no receipt goes out by itself: the owner or an instructor taps Resend: the receipt goes out with up-to-date information (student's name, subscription type, school, taxes, amount, payment date, method) and the same number. If the payment is cancelled (moved to the trash), a "Receipt No. … cancelled" notice is sent; restoring it then sends a corrected receipt.