Stamps.com - Void

{
  "carrier": "stamps",
  "action": "VoidShipment",
  "params": {
    "username": "YOUR_USERNAME",
    "password": "YOUR_PASSWORD",
    "shipment_id": "c605aec1-322e-48d5-bf81-b0bb820f9c22",
    "test": true
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'stamps',
  'action' => 'VoidShipment',
  'params' => 
  array (
    'username' => 'YOUR_USERNAME',
    'password' => 'YOUR_PASSWORD',
    'shipment_id' => 'c605aec1-322e-48d5-bf81-b0bb820f9c22',
    'test' => true,
  ),
)
);

rs.request(
  {'action': 'VoidShipment',
 'carrier': 'stamps',
 'params': {'password': 'YOUR_PASSWORD',
            'shipment_id': 'c605aec1-322e-48d5-bf81-b0bb820f9c22',
            'test': True,
            'username': 'YOUR_USERNAME'}}

)

rs.request(
  {"carrier"=>"stamps",
 "action"=>"VoidShipment",
 "params"=>
  {"username"=>"YOUR_USERNAME",
   "password"=>"YOUR_PASSWORD",
   "shipment_id"=>"c605aec1-322e-48d5-bf81-b0bb820f9c22",
   "test"=>true}}

)

rocketshipit.request(
  {
  "carrier": "stamps",
  "action": "VoidShipment",
  "params": {
    "username": "YOUR_USERNAME",
    "password": "YOUR_PASSWORD",
    "shipment_id": "c605aec1-322e-48d5-bf81-b0bb820f9c22",
    "test": true
  }
}
)