Bulk-Sending Invoices

What gets included

• Every invoice that's never been sent, as long as it has something outstanding (a zero-balance invoice that's never been sent isn't bulk-sent).
• Every invoice flagged needs_resend, regardless of its current balance — even a fully-paid one, since the parent needs to know the number changed.

What a parent receives

A student's first-ever send is the actual invoice — an SMS, plus a PDF emailed to the parent if an email address is on file. Every send after that (bulk or manual) is a shorter due/overdue reminder text instead, not a full re-send of the invoice.

Receipts

Receipts aren't part of bulk-send — they go out automatically whenever a payment is applied, whether that's a manual-payment approval or a provider payment settling. If a payment is later reversed or corrected, the parent gets a distinct correction message rather than a second receipt.