When you record a payment, Avaza can email your customer a short thank-you note. It's only sent if you ask for it.
Only Administrators and Finance Managers can record payments and change the email templates.
Send a thank-you note
Record the payment as usual.
On an invoice, click Record Payment. For a payment on its own, go to Invoices › Payments and click Record Payment.
Tick Email a 'Thank you' note for this payment.

Choose who gets it.
The list shows the customer's contacts. When you record the payment from an invoice, the invoice's Customer Contact is already chosen. You can add others.
Click Save Payment. Avaza emails the note.
You can only send the note while recording the payment: editing a payment later doesn't offer it. The people you send it to must be contacts of that customer, so if someone is missing, add them as a contact first.
The note comes from Avaza on your behalf, as "your name via Avaza", and replies go to your own email address.
Change the wording
Go to Settings › Email Templates and click Thank You Note for Payment.
Edit the Subject and Body in the Edit Template window.
You can use the placeholders [Company Name], [Customer Name] and [Payment Amount]. The payment amount is the whole payment, including any part you haven't applied to an invoice yet.
Click Save. Reset to Default brings back Avaza's original wording.
See email templates for the other emails you can change.
Payments your customers make online
If your customers pay through PayPal Express, Avaza can thank them automatically. Go to Settings › Online Payments, open your PayPal Express provider and tick Send Payment Thanks. The note goes to the invoice's Customer Contact, so it's only sent when the invoice has one.
Other online payments, such as Stripe, Payoneer and PayPal Standard, don't send a thank-you note. See online payments.