The badge.

Free listings display the “Listed on NZ Directory” badge somewhere on their site. That backlink keeps the directory discoverable and free. Paid listings skip it.

Auto, follows the visitor's light or dark mode (recommended)

<a href="https://nzdirectory.co.nz/companies/your-company">
  <picture>
    <source media="(prefers-color-scheme: dark)" srcset="https://nzdirectory.co.nz/badges/listed-dark.svg">
    <img src="https://nzdirectory.co.nz/badges/listed-light.svg"
         alt="Listed on NZ Directory" width="224" height="48">
  </picture>
</a>

Light, for light sites

<a href="https://nzdirectory.co.nz/companies/your-company">
  <img src="https://nzdirectory.co.nz/badges/listed-light.svg"
       alt="Listed on NZ Directory" width="224" height="48">
</a>

Dark, for dark sites

<a href="https://nzdirectory.co.nz/companies/your-company">
  <img src="https://nzdirectory.co.nz/badges/listed-dark.svg"
       alt="Listed on NZ Directory" width="224" height="48">
</a>

Mono, inherits currentColor

<a href="https://nzdirectory.co.nz/companies/your-company">
  <img src="https://nzdirectory.co.nz/badges/listed-mono.svg"
       alt="Listed on NZ Directory" width="224" height="48">
</a>

Guidelines

Place it in your footer, /about page, or press kit, anywhere crawlable.
Keep it at least 150 px wide; don't recolor or redraw it.
Swap the your-company slug for your listing's URL so the link resolves.
A plain dofollow text link to your listing counts too. The badge is encouraged for visibility, but a link is enough.

Automated verification

A scheduled job fetches each free listing's site and checks for the badge or backlink (see scripts/verify-badges.mjs), with a grace period before anything changes.