View source for Freeside talk:1.7/Configuration/settings/payment receipt email

For automatic payments (those triggered by the daily process or "Bill
now" link), a "statement" formatted just like an invoice (except saying
"Statement" and with different notes) is sent instead, if the config
files exist for it. Otherewise, "payment_receipts_email" is also used
for automatic payments, if it exists. Config options for these
statements for automatic payments:

invoice_html_statement (main statement email)
invoice_latexnotes_statement (notes for the bottom of HTML and typeset
statements)
invoice_template_statement (plaintext alternate)
invoice_latex_statement (not normally used - only if invoice_email_pdf
config option is enabled adding a PDF copy to emailed invoices)