Write your own text messages, and send the payment link by SMS

You can now change the wording of your text messages. Under Client emails &
reminders → Text messages, any message marked "Wording you can edit" opens an
editor where you write your own version, drop in details like the client's name
or the amount, and see live how many messages it will cost to send — useful,
because texts are billed per message and special characters shorten the limit.
Until you switch a message to your own wording, clients keep receiving the
standard text, so nothing changes unless you choose it.

The overdue-renewal payment link can now be sent by text. That option existed
before but never actually delivered; it works now, and its wording is editable
like the rest.

You never need to shorten a link yourself. Any link in a text message is
automatically replaced with a short link when it sends — this keeps messages
short and is required for texts to be delivered at all.