<?php require_once "../lib/easypost.php"; \EasyPost\EasyPost::setApiKey('cueqNZUb3ldeWTNX7MU3Mel8UXtaAMUi'); $trackers_rep = array(); for ($i = 0; $i < 5; $i++) { $tracker = array(); $tracker["tracking_code"] = "EZ2000000002"; $tracker["carrier"] = "USPS"; array_push($trackers_rep, $tracker); } $trackers = \EasyPost\Tracker::create_list($trackers_rep); var_dump($trackers);