Stamps.com - Pickup Cancel

{
    "carrier": "Stamps",
    "action": "CancelPickup",
    "params": {
      "username": "YOUR_USERNAME",
      "password": "YOUR_PASSWORD",
      "pickup_id": "WTC199744224",
      "test": true
    }
  }

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'Stamps',
  'action' => 'CancelPickup',
  'params' => 
  array (
    'username' => 'YOUR_USERNAME',
    'password' => 'YOUR_PASSWORD',
    'pickup_id' => 'WTC199744224',
    'test' => true,
  ),
)
);

rs.request(
  {'action': 'CancelPickup',
 'carrier': 'Stamps',
 'params': {'password': 'YOUR_PASSWORD',
            'pickup_id': 'WTC199744224',
            'test': True,
            'username': 'YOUR_USERNAME'}}

)

rs.request(
  {"carrier"=>"Stamps",
 "action"=>"CancelPickup",
 "params"=>
  {"username"=>"YOUR_USERNAME",
   "password"=>"YOUR_PASSWORD",
   "pickup_id"=>"WTC199744224",
   "test"=>true}}

)

rocketshipit.request(
  {
    "carrier": "Stamps",
    "action": "CancelPickup",
    "params": {
      "username": "YOUR_USERNAME",
      "password": "YOUR_PASSWORD",
      "pickup_id": "WTC199744224",
      "test": true
    }
  }
)