Calendar invite attached to or linked from the confirmation email

Without a .ics attachment, the booking lives only inside your email. Customers have to manually re-type the date, time, and timezone into their calendar — and half of them won't. The no-show rate for booking flows without calendar attachments is measurably higher than flows that attach .ics at confirmation time, because a calendar entry is the only thing that triggers the phone reminder ten minutes before the appointment. A text-only confirmation email is a user-experience failure that directly converts into lost revenue.

Generate the .ics synchronously inside the confirmation handler and attach it to the same email — do not ship a follow-up email with the invite, because customers open the confirmation once and never return. Set the attachment content-type to text/calendar. Edit src/lib/email.ts:

const icsData = await generateBookingICS(booking, booking.host)
await resend.emails.send({
  from: FROM_EMAIL,
  to: booking.customer_email,
  subject: `Confirmed: ${booking.service_name}`,
  html: confirmationEmailTemplate(booking),
  attachments: [{
    filename: 'booking.ics',
    content: Buffer.from(icsData).toString('base64'),
    contentType: 'text/calendar',
  }],
})