USPS-REST - Time in Transit

{
  "carrier": "USPS-REST",
  "action": "TimeInTransit",
  "params": {
    "key": "your-key-from-authenticate-request",
    "test": true,
    "ship_code": "59759",
    "to_code": "90210"
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'USPS-REST',
  'action' => 'TimeInTransit',
  'params' => 
  array (
    'key' => 'your-key-from-authenticate-request',
    'test' => true,
    'ship_code' => '59759',
    'to_code' => '90210',
  ),
)
);

rs.request(
  {'action': 'TimeInTransit',
 'carrier': 'USPS-REST',
 'params': {'key': 'your-key-from-authenticate-request',
            'ship_code': '59759',
            'test': True,
            'to_code': '90210'}}

)

rs.request(
  {"carrier"=>"USPS-REST",
 "action"=>"TimeInTransit",
 "params"=>
  {"key"=>"your-key-from-authenticate-request",
   "test"=>true,
   "ship_code"=>"59759",
   "to_code"=>"90210"}}

)

rocketshipit.request(
  {
  "carrier": "USPS-REST",
  "action": "TimeInTransit",
  "params": {
    "key": "your-key-from-authenticate-request",
    "test": true,
    "ship_code": "59759",
    "to_code": "90210"
  }
}
)