OnTrac - Label with References

{
  "carrier": "OnTrac",
  "action": "SubmitShipment",
  "params": {
    "reference_value": "my ref 1",
    "reference_value2": "my ref 2",
    "reference_value3": "my ref 3",
    "packages": [
      {
        "weight": 15
      }
    ],
    "service": "S",
    "shipper": "RocketShipIt",
    "ship_addr1": "940 Presidio Ave",
    "ship_city": "San Francisco",
    "ship_state": "CA",
    "ship_code": "94115",
    "ship_phone": "1231231234",
    "to_name": "John Doe",
    "to_addr1": "123 Main St",
    "to_state": "CA",
    "to_city": "Beverly Hills",
    "to_code": "90210",
    "to_phone": "1231231234",
    "packaging_type": "YOUR_PACKAGING",
    "test": true
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'OnTrac',
  'action' => 'SubmitShipment',
  'params' => 
  array (
    'reference_value' => 'my ref 1',
    'reference_value2' => 'my ref 2',
    'reference_value3' => 'my ref 3',
    'packages' => 
    array (
      0 => 
      array (
        'weight' => 15,
      ),
    ),
    'service' => 'S',
    'shipper' => 'RocketShipIt',
    'ship_addr1' => '940 Presidio Ave',
    'ship_city' => 'San Francisco',
    'ship_state' => 'CA',
    'ship_code' => '94115',
    'ship_phone' => '1231231234',
    'to_name' => 'John Doe',
    'to_addr1' => '123 Main St',
    'to_state' => 'CA',
    'to_city' => 'Beverly Hills',
    'to_code' => '90210',
    'to_phone' => '1231231234',
    'packaging_type' => 'YOUR_PACKAGING',
    'test' => true,
  ),
)
);

rs.request(
  {'action': 'SubmitShipment',
 'carrier': 'OnTrac',
 'params': {'packages': [{'weight': 15}],
            'packaging_type': 'YOUR_PACKAGING',
            'reference_value': 'my ref 1',
            'reference_value2': 'my ref 2',
            'reference_value3': 'my ref 3',
            'service': 'S',
            'ship_addr1': '940 Presidio Ave',
            'ship_city': 'San Francisco',
            'ship_code': '94115',
            'ship_phone': '1231231234',
            'ship_state': 'CA',
            'shipper': 'RocketShipIt',
            'test': True,
            'to_addr1': '123 Main St',
            'to_city': 'Beverly Hills',
            'to_code': '90210',
            'to_name': 'John Doe',
            'to_phone': '1231231234',
            'to_state': 'CA'}}

)

rs.request(
  {"carrier"=>"OnTrac",
 "action"=>"SubmitShipment",
 "params"=>
  {"reference_value"=>"my ref 1",
   "reference_value2"=>"my ref 2",
   "reference_value3"=>"my ref 3",
   "packages"=>[{"weight"=>15}],
   "service"=>"S",
   "shipper"=>"RocketShipIt",
   "ship_addr1"=>"940 Presidio Ave",
   "ship_city"=>"San Francisco",
   "ship_state"=>"CA",
   "ship_code"=>"94115",
   "ship_phone"=>"1231231234",
   "to_name"=>"John Doe",
   "to_addr1"=>"123 Main St",
   "to_state"=>"CA",
   "to_city"=>"Beverly Hills",
   "to_code"=>"90210",
   "to_phone"=>"1231231234",
   "packaging_type"=>"YOUR_PACKAGING",
   "test"=>true}}

)

rocketshipit.request(
  {
  "carrier": "OnTrac",
  "action": "SubmitShipment",
  "params": {
    "reference_value": "my ref 1",
    "reference_value2": "my ref 2",
    "reference_value3": "my ref 3",
    "packages": [
      {
        "weight": 15
      }
    ],
    "service": "S",
    "shipper": "RocketShipIt",
    "ship_addr1": "940 Presidio Ave",
    "ship_city": "San Francisco",
    "ship_state": "CA",
    "ship_code": "94115",
    "ship_phone": "1231231234",
    "to_name": "John Doe",
    "to_addr1": "123 Main St",
    "to_state": "CA",
    "to_city": "Beverly Hills",
    "to_code": "90210",
    "to_phone": "1231231234",
    "packaging_type": "YOUR_PACKAGING",
    "test": true
  }
}
)