</a>.   Store an API key in the environmental variable <code>"OPENCAGE_KEY"</code>.</p></li>
<li><p><code>"mapbox"</code>: <a href="https://docs.mapbox.com/api/search/" class="external-link">Mapbox</a>.   Store an API key in the environmental variable <code>"MAPBOX_API_KEY"</code>.</p></li>
<li><p><code>"here"</code>: <a href="https://www.here.com/platform/geocoding" class="external-link">HERE</a>.  Batch geocoding is supported, but must be explicitly called with <code>mode = "batch"</code>. Store an API ke