Create Shipment Label

Creates a shipping label. The labelData field returned in the response is a base64 encoded PDF value. Simply decode and save the output as a PDF file to retrieve a printable label. The body of this request has the following attributes:

Name	Data Type	Description
`carrierCode`	string, required	Identifies the carrier to be used for this label.
`serviceCode`	string, required	Identifies the shipping service to be used for this label.
`packageCode`	string, required	Identifies the packing type that should be used for this label.
`confirmation`	string, optional	The type of delivery confirmation that is to be used once the shipment is created. Possible values: `none`, `delivery`, `signature`, `adult_signature`, and `direct_signature`. `direct_signature` is available for FedEx only.
`shipDate`	string, required	The date the shipment will be shipped.
`weight`	Weight, required	Shipment's weight. Use the Weight model.
`dimensions`	Dimensions, optional	Shipment's dimensions. Use the Dimensions model.
`shipFrom`	Address, required	Address indicating shipment's origin. Use the Address model.
`shipTo`	Address, required	Address indicating shipment's destination. Use the Address model.
`insuranceOptions`	InsuranceOptions, optional	The shipping insurance information associated with this order. Use the InsuranceOptions model.
`internationalOptions`	InternationalOptions, optional	Customs information that can be used to generate customs documents for international orders. Use the InternationalOptions model.
`advancedOptions`	AdvancedOptions, optional	Various advanced options that may be available depending on the shipping carrier that is used to ship the order. Use the AdvancedOptions model.
`testLabel`	boolean, optional	Specifies whether a test label should be created. Default value: false.

Example Request

POST /shipments/createlabel HTTP/1.1
Host: ssapi.shipstation.com
Authorization: __YOUR_AUTH_HERE__
Content-Type: application/json

{
  "carrierCode": "fedex",
  "serviceCode": "fedex_ground",
  "packageCode": "package",
  "confirmation": "delivery",
  "shipDate": "2014-04-03",
  "weight": {
    "value": 3,
    "units": "ounces"
  },
  "dimensions": {
    "units": "inches",
    "length": 7,
    "width": 5,
    "height": 6
  },
  "shipFrom": {
    "name": "Jason Hodges",
    "company": "ShipStation",
    "street1": "2815 Exposition Blvd",
    "street2": "Ste 2353242",
    "street3": null,
    "city": "Austin",
    "state": "TX",
    "postalCode": "78703",
    "country": "US",
    "phone": null,
    "residential": false
  },
  "shipTo": {
    "name": "The President",
    "company": "US Govt",
    "street1": "1600 Pennsylvania Ave",
    "street2": "Oval Office",
    "street3": null,
    "city": "Washington",
    "state": "DC",
    "postalCode": "20500",
    "country": "US",
    "phone": null,
    "residential": false
  },
  "insuranceOptions": null,
  "internationalOptions": null,
  "advancedOptions": null,
  "testLabel": false
}

curl -iX POST https://ssapi.shipstation.com/shipments/createlabel \
-H 'Authorization: __YOUR_AUTH_HERE__' \
-H 'Content-Type: application/json' \
-d '{
  "carrierCode": "fedex",
  "serviceCode": "fedex_ground",
  "packageCode": "package",
  "confirmation": "delivery",
  "shipDate": "2014-04-03",
  "weight": {
    "value": 3,
    "units": "ounces"
  },
  "dimensions": {
    "units": "inches",
    "length": 7,
    "width": 5,
    "height": 6
  },
  "shipFrom": {
    "name": "Jason Hodges",
    "company": "ShipStation",
    "street1": "2815 Exposition Blvd",
    "street2": "Ste 2353242",
    "street3": null,
    "city": "Austin",
    "state": "TX",
    "postalCode": "78703",
    "country": "US",
    "phone": null,
    "residential": false
  },
  "shipTo": {
    "name": "The President",
    "company": "US Govt",
    "street1": "1600 Pennsylvania Ave",
    "street2": "Oval Office",
    "street3": null,
    "city": "Washington",
    "state": "DC",
    "postalCode": "20500",
    "country": "US",
    "phone": null,
    "residential": false
  },
  "insuranceOptions": null,
  "internationalOptions": null,
  "advancedOptions": null,
  "testLabel": false
}'

$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("Host", "ssapi.shipstation.com")
$headers.Add("Authorization", "__YOUR_AUTH_HERE__")
$headers.Add("Content-Type", "application/json")

$body = "{`n  `"carrierCode`": `"fedex`",`n  `"serviceCode`": `"fedex_ground`",`n  `"packageCode`": `"package`",`n  `"confirmation`": `"delivery`",`n  `"shipDate`": `"2014-04-03`",`n  `"weight`": {`n    `"value`": 3,`n    `"units`": `"ounces`"`n  },`n  `"dimensions`": {`n    `"units`": `"inches`",`n    `"length`": 7,`n    `"width`": 5,`n    `"height`": 6`n  },`n  `"shipFrom`": {`n    `"name`": `"Jason Hodges`",`n    `"company`": `"ShipStation`",`n    `"street1`": `"2815 Exposition Blvd`",`n    `"street2`": `"Ste 2353242`",`n    `"street3`": null,`n    `"city`": `"Austin`",`n    `"state`": `"TX`",`n    `"postalCode`": `"78703`",`n    `"country`": `"US`",`n    `"phone`": null,`n    `"residential`": false`n  },`n  `"shipTo`": {`n    `"name`": `"The President`",`n    `"company`": `"US Govt`",`n    `"street1`": `"1600 Pennsylvania Ave`",`n    `"street2`": `"Oval Office`",`n    `"street3`": null,`n    `"city`": `"Washington`",`n    `"state`": `"DC`",`n    `"postalCode`": `"20500`",`n    `"country`": `"US`",`n    `"phone`": null,`n    `"residential`": false`n  },`n  `"insuranceOptions`": null,`n  `"internationalOptions`": null,`n  `"advancedOptions`": null,`n  `"testLabel`": false`n}"

$response = Invoke-RestMethod 'https://ssapi.shipstation.com/shipments/createlabel' -Method 'POST' -Headers $headers -Body $body
$response | ConvertTo-Json

var myHeaders = new Headers();
myHeaders.append("Host", "ssapi.shipstation.com");
myHeaders.append("Authorization", "__YOUR_AUTH_HERE__");
myHeaders.append("Content-Type", "application/json");

var raw = JSON.stringify({"carrierCode":"fedex","serviceCode":"fedex_ground","packageCode":"package","confirmation":"delivery","shipDate":"2014-04-03","weight":{"value":3,"units":"ounces"},"dimensions":{"units":"inches","length":7,"width":5,"height":6},"shipFrom":{"name":"Jason Hodges","company":"ShipStation","street1":"2815 Exposition Blvd","street2":"Ste 2353242","street3":null,"city":"Austin","state":"TX","postalCode":"78703","country":"US","phone":null,"residential":false},"shipTo":{"name":"The President","company":"US Govt","street1":"1600 Pennsylvania Ave","street2":"Oval Office","street3":null,"city":"Washington","state":"DC","postalCode":"20500","country":"US","phone":null,"residential":false},"insuranceOptions":null,"internationalOptions":null,"advancedOptions":null,"testLabel":false});

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  body: raw,
  redirect: 'follow'
};

fetch("https://ssapi.shipstation.com/shipments/createlabel", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

var request = require('request');
var options = {
  'method': 'POST',
  'url': 'https://ssapi.shipstation.com/shipments/createlabel',
  'headers': {
    'Host': 'ssapi.shipstation.com',
    'Authorization': '__YOUR_AUTH_HERE__',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({"carrierCode":"fedex","serviceCode":"fedex_ground","packageCode":"package","confirmation":"delivery","shipDate":"2014-04-03","weight":{"value":3,"units":"ounces"},"dimensions":{"units":"inches","length":7,"width":5,"height":6},"shipFrom":{"name":"Jason Hodges","company":"ShipStation","street1":"2815 Exposition Blvd","street2":"Ste 2353242","street3":null,"city":"Austin","state":"TX","postalCode":"78703","country":"US","phone":null,"residential":false},"shipTo":{"name":"The President","company":"US Govt","street1":"1600 Pennsylvania Ave","street2":"Oval Office","street3":null,"city":"Washington","state":"DC","postalCode":"20500","country":"US","phone":null,"residential":false},"insuranceOptions":null,"internationalOptions":null,"advancedOptions":null,"testLabel":false})

};
request(options, function (error, response) { 
  if (error) throw new Error(error);
  console.log(response.body);
});

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://ssapi.shipstation.com/shipments/createlabel",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS =>"{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}",
  CURLOPT_HTTPHEADER => array(
    "Host: ssapi.shipstation.com",
    "Authorization: __YOUR_AUTH_HERE__",
    "Content-Type: application/json"
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

import requests

url = "https://ssapi.shipstation.com/shipments/createlabel"

payload = "{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}"
headers = {
  'Host': 'ssapi.shipstation.com',
  'Authorization': '__YOUR_AUTH_HERE__',
  'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data = payload)

print(response.text.encode('utf8'))

require "uri"
require "net/http"

url = URI("https://ssapi.shipstation.com/shipments/createlabel")

https = Net::HTTP.new(url.host, url.port);
https.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Host"] = "ssapi.shipstation.com"
request["Authorization"] = "__YOUR_AUTH_HERE__"
request["Content-Type"] = "application/json"
request.body = "{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}"

response = https.request(request)
puts response.read_body

var client = new RestClient("https://ssapi.shipstation.com/shipments/createlabel");
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Host", "ssapi.shipstation.com");
request.AddHeader("Authorization", "__YOUR_AUTH_HERE__");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}",  ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);

OkHttpClient client = new OkHttpClient().newBuilder()
  .build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}");
Request request = new Request.Builder()
  .url("https://ssapi.shipstation.com/shipments/createlabel")
  .method("POST", body)
  .addHeader("Host", "ssapi.shipstation.com")
  .addHeader("Authorization", "__YOUR_AUTH_HERE__")
  .addHeader("Content-Type", "application/json")
  .build();
Response response = client.newCall(request).execute();

package main

import (
  "fmt"
  "strings"
  "net/http"
  "io/ioutil"
)

func main() {

  url := "https://ssapi.shipstation.com/shipments/createlabel"
  method := "POST"

  payload := strings.NewReader("{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}")

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
  }
  req.Header.Add("Host", "ssapi.shipstation.com")
  req.Header.Add("Authorization", "__YOUR_AUTH_HERE__")
  req.Header.Add("Content-Type", "application/json")

  res, err := client.Do(req)
  defer res.Body.Close()
  body, err := ioutil.ReadAll(res.Body)

  fmt.Println(string(body))
}

#import <Foundation/Foundation.h>

dispatch_semaphore_t sema = dispatch_semaphore_create(0);

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://ssapi.shipstation.com/shipments/createlabel"]
  cachePolicy:NSURLRequestUseProtocolCachePolicy
  timeoutInterval:10.0];
NSDictionary *headers = @{
  @"Host": @"ssapi.shipstation.com",
  @"Authorization": @"__YOUR_AUTH_HERE__",
  @"Content-Type": @"application/json"
};

[request setAllHTTPHeaderFields:headers];
NSData *postData = [[NSData alloc] initWithData:[@"{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}" dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:postData];

[request setHTTPMethod:@"POST"];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
  if (error) {
    NSLog(@"%@", error);
  } else {
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
    NSError *parseError = nil;
    NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
    NSLog(@"%@",responseDictionary);
    dispatch_semaphore_signal(sema);
  }
}];
[dataTask resume];
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);

import Foundation

var semaphore = DispatchSemaphore (value: 0)

let parameters = "{\n  \"carrierCode\": \"fedex\",\n  \"serviceCode\": \"fedex_ground\",\n  \"packageCode\": \"package\",\n  \"confirmation\": \"delivery\",\n  \"shipDate\": \"2014-04-03\",\n  \"weight\": {\n    \"value\": 3,\n    \"units\": \"ounces\"\n  },\n  \"dimensions\": {\n    \"units\": \"inches\",\n    \"length\": 7,\n    \"width\": 5,\n    \"height\": 6\n  },\n  \"shipFrom\": {\n    \"name\": \"Jason Hodges\",\n    \"company\": \"ShipStation\",\n    \"street1\": \"2815 Exposition Blvd\",\n    \"street2\": \"Ste 2353242\",\n    \"street3\": null,\n    \"city\": \"Austin\",\n    \"state\": \"TX\",\n    \"postalCode\": \"78703\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"shipTo\": {\n    \"name\": \"The President\",\n    \"company\": \"US Govt\",\n    \"street1\": \"1600 Pennsylvania Ave\",\n    \"street2\": \"Oval Office\",\n    \"street3\": null,\n    \"city\": \"Washington\",\n    \"state\": \"DC\",\n    \"postalCode\": \"20500\",\n    \"country\": \"US\",\n    \"phone\": null,\n    \"residential\": false\n  },\n  \"insuranceOptions\": null,\n  \"internationalOptions\": null,\n  \"advancedOptions\": null,\n  \"testLabel\": false\n}"
let postData = parameters.data(using: .utf8)

var request = URLRequest(url: URL(string: "https://ssapi.shipstation.com/shipments/createlabel")!,timeoutInterval: Double.infinity)
request.addValue("ssapi.shipstation.com", forHTTPHeaderField: "Host")
request.addValue("__YOUR_AUTH_HERE__", forHTTPHeaderField: "Authorization")
request.addValue("application/json", forHTTPHeaderField: "Content-Type")

request.httpMethod = "POST"
request.httpBody = postData

let task = URLSession.shared.dataTask(with: request) { data, response, error in 
  guard let data = data else {
    print(String(describing: error))
    return
  }
  print(String(data: data, encoding: .utf8)!)
  semaphore.signal()
}

task.resume()
semaphore.wait()

Example Response

{
  "shipmentId": 123456789,
  "orderId": null,
  "userId": null,
  "customerEmail": null,
  "orderNumber": null,
  "createDate": "2016-04-03T12:11:36.8630000",
  "shipDate": "2016-04-03",
  "shipmentCost": 9.06,
  "insuranceCost": 0,
  "trackingNumber": "782390443992",
  "isReturnLabel": false,
  "batchNumber": null,
  "carrierCode": "fedex",
  "serviceCode": "fedex_ground",
  "packageCode": "package",
  "confirmation": "delivery",
  "warehouseId": null,
  "voided": false,
  "voidDate": null,
  "marketplaceNotified": false,
  "notifyErrorMessage": null,
  "shipTo": null,
  "weight": null,
  "dimensions": null,
  "insuranceOptions": null,
  "advancedOptions": null,
  "shipmentItems": null,
  "labelData": "JVBERi0xLjQKJeLjz9MKMiAwIG9iago8PC9MZW5ndGggNjIvRmlsdGVyL0ZsYXRlRGVjb2RlPj5zdHJlYW0KeJwr5HIK4TI2U...",
  "formData": null
}