Use caseFewer missed appointments, with a WhatsApp reminder the evening before.

Step by step, for real.

1. 1

   The reminder template

   Claude Code creates it with create_template: utility category, the first name and the time, two quick reply buttons, “Confirm” and “Reschedule”. Meta approves it, often within minutes.

2. 2

   The day-before job

   Every evening, your app sends the next day’s reminders with POST /v1/sends, with an idempotency key taken from the appointment: run again, it does not send twice.

3. 3

   The “Confirm” button

   It comes back in the message.received event, by its label; your route finds the last reminder sent to the number and confirms the appointment.

4. 4

   The “Reschedule” button

   The AI agent answers and triggers an action set with set_agent_action: your app receives agent.action, offers free slots with POST /v1/messages/whatsapp, then moves the one the customer picks.

What you type in Claude Code

With the plugin installed, one sentence is enough: Claude Code creates the template, sets up the agent, writes the code and tests it.

the day before each appointment (lib/calendar.ts), send a whatsapp reminder with two buttons, confirm and reschedule. if the customer reschedules, the agent offers three free slots and my app moves the appointment

The day-before job, as Claude Code writes it

import { messagingme } from '../lib/messagingme';
import { saveReminder, tomorrowsAppointments } from '../lib/calendar';

// Run once a day, the evening before (a cron of your host). The template appointment_reminder has two variables,
// the first name then the time, and two quick reply buttons: Confirm and Reschedule.
export async function dayBeforeReminders(): Promise<void> {
  for (const appointment of await tomorrowsAppointments()) {
    const send = await messagingme.POST('/v1/sends', {
      body: {
        target: { template: { name: 'appointment_reminder', language: 'en' } },
        recipients: [{ phone: appointment.phone, variables: { firstName: appointment.firstName, time: appointment.time } }],
        params: [
          { position: 1, source: { type: 'variable', key: 'firstName' } },
          { position: 2, source: { type: 'variable', key: 'time' } },
        ],
      },
      // Run twice for the same appointment, the job does not send twice.
      idempotencyKey: `reminder-${appointment.id}`,
    });
    await saveReminder(appointment, send.sendId);
  }
}

jobs/reminders.ts · all the code in the guide