Canada Post - Label Return with Reference

{
  "carrier": "Canada",
  "action": "SubmitShipment",
  "params": {
    "username": "YOUR_URSERNAME",
    "password": "YOUR_PASSWORD", 
    "account_number": "YOUR_ACCOUNT_NUMBER",
    "return_code": "PRINT_RETURN_LABEL",
    "service": "DOM.EP",
    "packages": [
      {
        "weight": 2,
        "reference_value": "my reference value",
        "reference_value2": "another reference"
      }
    ],
    "ship_name": "Jane Doe Returner",
    "shipper": "Capsule Corp.",
    "ship_addr1": "2701 Return Avenue",
    "ship_city": "Ottawa",
    "ship_state": "ON",
    "ship_code": "K1A0B1",
    "ship_country": "CA",
    "to_name": "John Doe",
    "to_company": "Receiver of Return",
    "to_addr1": "2701 Riverside Drive",
    "to_state": "ON",
    "to_city": "Ottawa",
    "to_code": "K1A0B1",
    "to_country": "CA",
    "test": true
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'Canada',
  'action' => 'SubmitShipment',
  'params' => 
  array (
    'username' => 'YOUR_URSERNAME',
    'password' => 'YOUR_PASSWORD',
    'account_number' => 'YOUR_ACCOUNT_NUMBER',
    'return_code' => 'PRINT_RETURN_LABEL',
    'service' => 'DOM.EP',
    'packages' => 
    array (
      0 => 
      array (
        'weight' => 2,
        'reference_value' => 'my reference value',
        'reference_value2' => 'another reference',
      ),
    ),
    'ship_name' => 'Jane Doe Returner',
    'shipper' => 'Capsule Corp.',
    'ship_addr1' => '2701 Return Avenue',
    'ship_city' => 'Ottawa',
    'ship_state' => 'ON',
    'ship_code' => 'K1A0B1',
    'ship_country' => 'CA',
    'to_name' => 'John Doe',
    'to_company' => 'Receiver of Return',
    'to_addr1' => '2701 Riverside Drive',
    'to_state' => 'ON',
    'to_city' => 'Ottawa',
    'to_code' => 'K1A0B1',
    'to_country' => 'CA',
    'test' => true,
  ),
)
);

rs.request(
  {'action': 'SubmitShipment',
 'carrier': 'Canada',
 'params': {'account_number': 'YOUR_ACCOUNT_NUMBER',
            'packages': [{'reference_value': 'my reference value',
                          'reference_value2': 'another reference',
                          'weight': 2}],
            'password': 'YOUR_PASSWORD',
            'return_code': 'PRINT_RETURN_LABEL',
            'service': 'DOM.EP',
            'ship_addr1': '2701 Return Avenue',
            'ship_city': 'Ottawa',
            'ship_code': 'K1A0B1',
            'ship_country': 'CA',
            'ship_name': 'Jane Doe Returner',
            'ship_state': 'ON',
            'shipper': 'Capsule Corp.',
            'test': True,
            'to_addr1': '2701 Riverside Drive',
            'to_city': 'Ottawa',
            'to_code': 'K1A0B1',
            'to_company': 'Receiver of Return',
            'to_country': 'CA',
            'to_name': 'John Doe',
            'to_state': 'ON',
            'username': 'YOUR_URSERNAME'}}

)

rs.request(
  {"carrier"=>"Canada",
 "action"=>"SubmitShipment",
 "params"=>
  {"username"=>"YOUR_URSERNAME",
   "password"=>"YOUR_PASSWORD",
   "account_number"=>"YOUR_ACCOUNT_NUMBER",
   "return_code"=>"PRINT_RETURN_LABEL",
   "service"=>"DOM.EP",
   "packages"=>
    [{"weight"=>2,
      "reference_value"=>"my reference value",
      "reference_value2"=>"another reference"}],
   "ship_name"=>"Jane Doe Returner",
   "shipper"=>"Capsule Corp.",
   "ship_addr1"=>"2701 Return Avenue",
   "ship_city"=>"Ottawa",
   "ship_state"=>"ON",
   "ship_code"=>"K1A0B1",
   "ship_country"=>"CA",
   "to_name"=>"John Doe",
   "to_company"=>"Receiver of Return",
   "to_addr1"=>"2701 Riverside Drive",
   "to_state"=>"ON",
   "to_city"=>"Ottawa",
   "to_code"=>"K1A0B1",
   "to_country"=>"CA",
   "test"=>true}}

)

rocketshipit.request(
  {
  "carrier": "Canada",
  "action": "SubmitShipment",
  "params": {
    "username": "YOUR_URSERNAME",
    "password": "YOUR_PASSWORD", 
    "account_number": "YOUR_ACCOUNT_NUMBER",
    "return_code": "PRINT_RETURN_LABEL",
    "service": "DOM.EP",
    "packages": [
      {
        "weight": 2,
        "reference_value": "my reference value",
        "reference_value2": "another reference"
      }
    ],
    "ship_name": "Jane Doe Returner",
    "shipper": "Capsule Corp.",
    "ship_addr1": "2701 Return Avenue",
    "ship_city": "Ottawa",
    "ship_state": "ON",
    "ship_code": "K1A0B1",
    "ship_country": "CA",
    "to_name": "John Doe",
    "to_company": "Receiver of Return",
    "to_addr1": "2701 Riverside Drive",
    "to_state": "ON",
    "to_city": "Ottawa",
    "to_code": "K1A0B1",
    "to_country": "CA",
    "test": true
  }
}
)