A customer who receives a text doesn't see the custom code that decided what it should say. They just see a confirmation that already knows their order number, a reminder already adjusted for their timezone or a reply that reads as if someone wrote it specifically for them.

Functions by Zapier makes that possible by running a short piece of code partway through a Zap. Its action, Call a Function, takes the data collected from an earlier trigger, whether that's a paid Shopify order, a new Typeform entry or a fresh Calendly booking, reshapes or calculates whatever the message needs, and hands the result on. Mobile Message connects to Zapier too, so the next step in that same Zap can send the finished text through Send SMS, with the work already done by the function that ran before it. A business automating in Zapier can lean on that same function for more than one Zap, reusing it wherever a message needs the same calculation before it goes out.