USPS - Tracking

{
  "carrier": "USPS",
  "action": "track",
  "params": {
    "username": "YOUR_USERNAME",
    "tracking_number": "9361289878130102925130"
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'USPS',
  'action' => 'track',
  'params' => 
  array (
    'username' => 'YOUR_USERNAME',
    'tracking_number' => '9361289878130102925130',
  ),
)
);

rs.request(
  {'action': 'track',
 'carrier': 'USPS',
 'params': {'tracking_number': '9361289878130102925130',
            'username': 'YOUR_USERNAME'}}

)

rs.request(
  {"carrier"=>"USPS",
 "action"=>"track",
 "params"=>
  {"username"=>"YOUR_USERNAME", "tracking_number"=>"9361289878130102925130"}}

)

rocketshipit.request(
  {
  "carrier": "USPS",
  "action": "track",
  "params": {
    "username": "YOUR_USERNAME",
    "tracking_number": "9361289878130102925130"
  }
}
)