USPS-REST - Tracking

{
  "carrier": "USPS-REST",
  "action": "track",
  "params": {
    "key": "your-key-from-authenticate-request",
    "tracking_number": "9405509206486033133221"
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'USPS-REST',
  'action' => 'track',
  'params' => 
  array (
    'key' => 'your-key-from-authenticate-request',
    'tracking_number' => '9405509206486033133221',
  ),
)
);

rs.request(
  {'action': 'track',
 'carrier': 'USPS-REST',
 'params': {'key': 'your-key-from-authenticate-request',
            'tracking_number': '9405509206486033133221'}}

)

rs.request(
  {"carrier"=>"USPS-REST",
 "action"=>"track",
 "params"=>
  {"key"=>"your-key-from-authenticate-request",
   "tracking_number"=>"9405509206486033133221"}}

)

rocketshipit.request(
  {
  "carrier": "USPS-REST",
  "action": "track",
  "params": {
    "key": "your-key-from-authenticate-request",
    "tracking_number": "9405509206486033133221"
  }
}
)