curl --request POST \
  --url https://scx-sbx.api.jtl-software.com/v1/seller/ticket/attachment/{channel} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'attachmentData={
  "sellerId": "4711",
  "ticketId": "CASE-01071982",
  "filename": "product.png"
}' \
  --form attachment='@example-file'

import requests

url = "https://scx-sbx.api.jtl-software.com/v1/seller/ticket/attachment/{channel}"

files = { "attachment": ("example-file", open("example-file", "rb")) }
payload = { "attachmentData": "{
  \"sellerId\": \"4711\",
  \"ticketId\": \"CASE-01071982\",
  \"filename\": \"product.png\"
}" }
headers = {"Authorization": "Bearer <token>"}

response = requests.post(url, data=payload, files=files, headers=headers)

print(response.text)

const form = new FormData();
form.append('attachmentData', '{
  "sellerId": "4711",
  "ticketId": "CASE-01071982",
  "filename": "product.png"
}');
form.append('attachment', '<string>');

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

options.body = form;

fetch('https://scx-sbx.api.jtl-software.com/v1/seller/ticket/attachment/{channel}', 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://scx-sbx.api.jtl-software.com/v1/seller/ticket/attachment/{channel}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachmentData\"\r\n\r\n{\r\n  \"sellerId\": \"4711\",\r\n  \"ticketId\": \"CASE-01071982\",\r\n  \"filename\": \"product.png\"\r\n}\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachment\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: multipart/form-data"
  ],
]);

$response = curl_exec($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://scx-sbx.api.jtl-software.com/v1/seller/ticket/attachment/{channel}"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachmentData\"\r\n\r\n{\r\n  \"sellerId\": \"4711\",\r\n  \"ticketId\": \"CASE-01071982\",\r\n  \"filename\": \"product.png\"\r\n}\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachment\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")

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

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://scx-sbx.api.jtl-software.com/v1/seller/ticket/attachment/{channel}")
  .header("Authorization", "Bearer <token>")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachmentData\"\r\n\r\n{\r\n  \"sellerId\": \"4711\",\r\n  \"ticketId\": \"CASE-01071982\",\r\n  \"filename\": \"product.png\"\r\n}\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachment\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://scx-sbx.api.jtl-software.com/v1/seller/ticket/attachment/{channel}")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachmentData\"\r\n\r\n{\r\n  \"sellerId\": \"4711\",\r\n  \"ticketId\": \"CASE-01071982\",\r\n  \"filename\": \"product.png\"\r\n}\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"attachment\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--"

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

{
  "errorList": [
    {
      "code": "VAL100",
      "message": "Required field sellerId not found",
      "severity": "error",
      "hint": "Check the field `sellerId` — it must be a non-empty string."
    }
  ]
}

{
  "errorList": [
    {
      "code": "GEN404",
      "message": "Not found",
      "severity": "error",
      "hint": null
    }
  ]
}

{
  "errorList": [
    {
      "code": "GEN500",
      "message": "Internal Server Error",
      "severity": "error",
      "hint": null
    }
  ]
}