curl --request POST \
  --url https://api.terminal49.com/v2/shipments/{shipment_id}/party_roles \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "type": "party_role",
    "attributes": {
      "role": "shipper"
    },
    "relationships": {
      "party": {
        "data": {
          "id": "ba4cb904-827f-4038-8e31-1e92b3356218",
          "type": "party"
        }
      }
    }
  }
}
'

import requests

url = "https://api.terminal49.com/v2/shipments/{shipment_id}/party_roles"

payload = { "data": {
        "type": "party_role",
        "attributes": { "role": "shipper" },
        "relationships": { "party": { "data": {
                    "id": "ba4cb904-827f-4038-8e31-1e92b3356218",
                    "type": "party"
                } } }
    } }
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    data: {
      type: 'party_role',
      attributes: {role: 'shipper'},
      relationships: {party: {data: {id: 'ba4cb904-827f-4038-8e31-1e92b3356218', type: 'party'}}}
    }
  })
};

fetch('https://api.terminal49.com/v2/shipments/{shipment_id}/party_roles', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.terminal49.com/v2/shipments/{shipment_id}/party_roles",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'data' => [
        'type' => 'party_role',
        'attributes' => [
                'role' => 'shipper'
        ],
        'relationships' => [
                'party' => [
                                'data' => [
                                                                'id' => 'ba4cb904-827f-4038-8e31-1e92b3356218',
                                                                'type' => 'party'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.terminal49.com/v2/shipments/{shipment_id}/party_roles"

	payload := strings.NewReader("{\n  \"data\": {\n    \"type\": \"party_role\",\n    \"attributes\": {\n      \"role\": \"shipper\"\n    },\n    \"relationships\": {\n      \"party\": {\n        \"data\": {\n          \"id\": \"ba4cb904-827f-4038-8e31-1e92b3356218\",\n          \"type\": \"party\"\n        }\n      }\n    }\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.terminal49.com/v2/shipments/{shipment_id}/party_roles")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"type\": \"party_role\",\n    \"attributes\": {\n      \"role\": \"shipper\"\n    },\n    \"relationships\": {\n      \"party\": {\n        \"data\": {\n          \"id\": \"ba4cb904-827f-4038-8e31-1e92b3356218\",\n          \"type\": \"party\"\n        }\n      }\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.terminal49.com/v2/shipments/{shipment_id}/party_roles")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"data\": {\n    \"type\": \"party_role\",\n    \"attributes\": {\n      \"role\": \"shipper\"\n    },\n    \"relationships\": {\n      \"party\": {\n        \"data\": {\n          \"id\": \"ba4cb904-827f-4038-8e31-1e92b3356218\",\n          \"type\": \"party\"\n        }\n      }\n    }\n  }\n}"

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