INVP::fetch_latitude_and_longitude( int $location_term_id )

	public static function fetch_latitude_and_longitude( $location_term_id ) {
		// Get all term meta for this location
		$meta = get_term_meta( $location_term_id );
		// Do we already have a saved latitude and longitude pair?
		if ( ! empty( $meta['address_lat'][0] ) && ! empty( $meta['address_lon'][0] ) ) {
			// Yes
			return (object) array(
				'lat' => $meta['address_lat'][0],
				'lon' => $meta['address_lon'][0],
			);
		}

		/**
		 * Get latitude and longitude using the address, but use a version of
		 * the address without street address line two (unless that version of
		 * the address has been added to OpenStreetMap.org).
		 */
		$address_str = '';
		if ( ! empty( $meta['address_street'][0] ) ) {
			$address_str .= $meta['address_street'][0];
		}
		if ( ! empty( $meta['address_city'][0] ) ) {
			$address_str .= ', ' . $meta['address_city'][0];
		}
		if ( ! empty( $meta['address_state'][0] ) ) {
			$address_str .= ', ' . $meta['address_state'][0];
		}
		if ( ! empty( $meta['address_zip'][0] ) ) {
			$address_str .= ' ' . $meta['address_zip'][0];
		}
		if ( empty( trim( $address_str, ', \n\r\t\v\0' ) ) ) {
			return false;
		}

		$result = wp_remote_get( 'https://nominatim.openstreetmap.org/search?format=json&q=' . rawurlencode( $address_str ) );
		if ( is_wp_error( $result ) ) {
			return false;
		}
		$body = json_decode( wp_remote_retrieve_body( $result ) );
		if ( ! empty( $body[0] ) && ! empty( $body[0]->lat ) && ! empty( $body[0]->lon ) ) {
			/**
			 * Save the latitude and longitude coordinates so we don't have to
			 * look them up again.
			 */
			update_term_meta( $location_term_id, 'address_lat', $body[0]->lat );
			update_term_meta( $location_term_id, 'address_lon', $body[0]->lon );

			return (object) array(
				'lat' => $body[0]->lat,
				'lon' => $body[0]->lon,
			);
		}

		// The address probably doesn't exist on OpenStreetMap.org. (Go add it!)
		return false;
	}