USPS - Label International Priority Mail

{
  "carrier": "USPS",
  "action": "SubmitShipment",
  "params": {
    "username": "YOUR_USERNAME",
    "packages": [
      {
        "weight": 5,
        "length": 6,
        "width": 7,
        "height": 8
      }
    ],
    "customs": [
      {
        "customs_description": "my shipment",
        "customs_quantity": 1,
        "customs_weight": 2.5,
        "customs_value": 5.0,
        "customs_hs_tariff": "",
        "customs_origin_country": "US"
      }
    ],
    "shipper": "RocketShipIt",
    "ship_addr1": "123 Main St",
    "ship_city": "Whitehall",
    "ship_state": "MT",
    "ship_code": "59759",
    "ship_phone": "1231231234",
    "to_name": "Toronto Zoo",
    "to_addr1": "2000 Meadowvale Road",
    "to_state": "MB",
    "to_city": "Toronto",
    "to_code": "M1B5K7",
    "to_phone": "1231231234",
    "to_country": "CA",
    "test": true,
    "service": "US-PMI",
    "reference_value": "asdf",
    "customs_content_type": "SAMPLE"
  }
}

<?php
$rs = new RocketShipIt;
$response = $rs->request(
array (
  'carrier' => 'USPS',
  'action' => 'SubmitShipment',
  'params' => 
  array (
    'username' => 'YOUR_USERNAME',
    'packages' => 
    array (
      0 => 
      array (
        'weight' => 5,
        'length' => 6,
        'width' => 7,
        'height' => 8,
      ),
    ),
    'customs' => 
    array (
      0 => 
      array (
        'customs_description' => 'my shipment',
        'customs_quantity' => 1,
        'customs_weight' => 2.5,
        'customs_value' => 5.0,
        'customs_hs_tariff' => '',
        'customs_origin_country' => 'US',
      ),
    ),
    'shipper' => 'RocketShipIt',
    'ship_addr1' => '123 Main St',
    'ship_city' => 'Whitehall',
    'ship_state' => 'MT',
    'ship_code' => '59759',
    'ship_phone' => '1231231234',
    'to_name' => 'Toronto Zoo',
    'to_addr1' => '2000 Meadowvale Road',
    'to_state' => 'MB',
    'to_city' => 'Toronto',
    'to_code' => 'M1B5K7',
    'to_phone' => '1231231234',
    'to_country' => 'CA',
    'test' => true,
    'service' => 'US-PMI',
    'reference_value' => 'asdf',
    'customs_content_type' => 'SAMPLE',
  ),
)
);

rs.request(
  {'action': 'SubmitShipment',
 'carrier': 'USPS',
 'params': {'customs': [{'customs_description': 'my shipment',
                         'customs_hs_tariff': '',
                         'customs_origin_country': 'US',
                         'customs_quantity': 1,
                         'customs_value': 5.0,
                         'customs_weight': 2.5}],
            'customs_content_type': 'SAMPLE',
            'packages': [{'height': 8, 'length': 6, 'weight': 5, 'width': 7}],
            'reference_value': 'asdf',
            'service': 'US-PMI',
            'ship_addr1': '123 Main St',
            'ship_city': 'Whitehall',
            'ship_code': '59759',
            'ship_phone': '1231231234',
            'ship_state': 'MT',
            'shipper': 'RocketShipIt',
            'test': True,
            'to_addr1': '2000 Meadowvale Road',
            'to_city': 'Toronto',
            'to_code': 'M1B5K7',
            'to_country': 'CA',
            'to_name': 'Toronto Zoo',
            'to_phone': '1231231234',
            'to_state': 'MB',
            'username': 'YOUR_USERNAME'}}

)

rs.request(
  {"carrier"=>"USPS",
 "action"=>"SubmitShipment",
 "params"=>
  {"username"=>"YOUR_USERNAME",
   "packages"=>[{"weight"=>5, "length"=>6, "width"=>7, "height"=>8}],
   "customs"=>
    [{"customs_description"=>"my shipment",
      "customs_quantity"=>1,
      "customs_weight"=>2.5,
      "customs_value"=>5.0,
      "customs_hs_tariff"=>"",
      "customs_origin_country"=>"US"}],
   "shipper"=>"RocketShipIt",
   "ship_addr1"=>"123 Main St",
   "ship_city"=>"Whitehall",
   "ship_state"=>"MT",
   "ship_code"=>"59759",
   "ship_phone"=>"1231231234",
   "to_name"=>"Toronto Zoo",
   "to_addr1"=>"2000 Meadowvale Road",
   "to_state"=>"MB",
   "to_city"=>"Toronto",
   "to_code"=>"M1B5K7",
   "to_phone"=>"1231231234",
   "to_country"=>"CA",
   "test"=>true,
   "service"=>"US-PMI",
   "reference_value"=>"asdf",
   "customs_content_type"=>"SAMPLE"}}

)

rocketshipit.request(
  {
  "carrier": "USPS",
  "action": "SubmitShipment",
  "params": {
    "username": "YOUR_USERNAME",
    "packages": [
      {
        "weight": 5,
        "length": 6,
        "width": 7,
        "height": 8
      }
    ],
    "customs": [
      {
        "customs_description": "my shipment",
        "customs_quantity": 1,
        "customs_weight": 2.5,
        "customs_value": 5.0,
        "customs_hs_tariff": "",
        "customs_origin_country": "US"
      }
    ],
    "shipper": "RocketShipIt",
    "ship_addr1": "123 Main St",
    "ship_city": "Whitehall",
    "ship_state": "MT",
    "ship_code": "59759",
    "ship_phone": "1231231234",
    "to_name": "Toronto Zoo",
    "to_addr1": "2000 Meadowvale Road",
    "to_state": "MB",
    "to_city": "Toronto",
    "to_code": "M1B5K7",
    "to_phone": "1231231234",
    "to_country": "CA",
    "test": true,
    "service": "US-PMI",
    "reference_value": "asdf",
    "customs_content_type": "SAMPLE"
  }
}
)