Stamps.com - Rates GlobalPost Economy

{
  "carrier": "stamps",
  "action": "getallrates",
  "params": {
    "username": "YOUR_USERNAME",
    "password": "YOUR_PASSWORD",
    "packages": [
      {
        "weight": 4
      }
    ],
	"service": "SC-GPE",
    "ship_code": "59759",
    "to_country": "CA"
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'stamps',
  'action' => 'getallrates',
  'params' => 
  array (
    'username' => 'YOUR_USERNAME',
    'password' => 'YOUR_PASSWORD',
    'packages' => 
    array (
      0 => 
      array (
        'weight' => 4,
      ),
    ),
    'service' => 'SC-GPE',
    'ship_code' => '59759',
    'to_country' => 'CA',
  ),
)
);

rs.request(
  {'action': 'getallrates',
 'carrier': 'stamps',
 'params': {'packages': [{'weight': 4}],
            'password': 'YOUR_PASSWORD',
            'service': 'SC-GPE',
            'ship_code': '59759',
            'to_country': 'CA',
            'username': 'YOUR_USERNAME'}}

)

rs.request(
  {"carrier"=>"stamps",
 "action"=>"getallrates",
 "params"=>
  {"username"=>"YOUR_USERNAME",
   "password"=>"YOUR_PASSWORD",
   "packages"=>[{"weight"=>4}],
   "service"=>"SC-GPE",
   "ship_code"=>"59759",
   "to_country"=>"CA"}}

)

rocketshipit.request(
  {
  "carrier": "stamps",
  "action": "getallrates",
  "params": {
    "username": "YOUR_USERNAME",
    "password": "YOUR_PASSWORD",
    "packages": [
      {
        "weight": 4
      }
    ],
	"service": "SC-GPE",
    "ship_code": "59759",
    "to_country": "CA"
  }
}
)