The service id used to modify the mapped event details.
		 */
		$next_attendee = apply_filters( 'tec_automator_map_attendee_details', $next_attendee, $attendee, $service_id );
		// Zapier only requires an id field, if that is empty send a generic invalid message.
		if ( empty( $next_attendee['id'] ) ) {
			return [ 'id' => 'invalid-attendee-id.' ];
		}

		return $next_attendee;
	}

	/**
	 * Get Attendee Meta.
	 *
	 * @since 6.0.0 Migrated to Common from Event Automator
	 *
	 * @param array<string|mixed> $attendee An array of attendee details.
	 *
	 * @return array<string|mixed> $meta_array  Meta attendee array.
	 */
	public function get_attendee_meta( $attendee ) {
		if ( empty( $attendee['attendee_meta'] ) ) {
			return [];
		}

		$meta_array = [];
		foreach ( $attendee['attendee_meta'] as $key => $item ) {
			if ( empty( $item['value'] ) ) {
				continue;
			}
			$value = $item['value'];

			// If value is an array, convert each item to a string and remove the keys.
			if ( is_array( $value ) ) {
				$value = array_values( array_map( 'strval', $value ) );
			} else {
				$value = [ (string) $value ];
			}

			$meta_array[] = [
				'attendee_meta_id'    => $item['slug'],
				'attendee_meta_name'  => $item['label'],
				'attendee_meta_value' => $value,
			];
		}

		return $meta_array;
	}
}