Prepares new sending batch

curl --request POST \
     --url https://api.campaign.episerver.net/rest/{clientId}/sending/batches \
     --header 'accept: application/json' \
     --header 'content-type: multipart/form-data' \
     --form 'campaign="string"' \
     --form 'campaignAction="use"'

var myHeaders = new Headers();
myHeaders.append("accept", "application/json");
myHeaders.append("content-type", "multipart/form-data");

var formdata = new FormData();
formdata.append("campaign", "string");
formdata.append("campaignAction", "use");

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

fetch("https://api.campaign.episerver.net/rest/{clientId}/sending/batches", requestOptions)
   .then(response => response.text())
   .then(result => console.log(result))
   .catch(error => console.log('error', error));

require "uri"
require "net/http"

url = URI("https://api.campaign.episerver.net/rest/{clientId}/sending/batches")

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

request = Net::HTTP::Post.new(url)
request["accept"] = "application/json"
request["content-type"] = "multipart/form-data"
form_data = [['campaign', File.open('undefined')],['campaignAction', File.open('undefined')]]
request.set_form form_data, 'multipart/form-data'
response = https.request(request)
puts response.read_body

import requests

url = "https://api.campaign.episerver.net/rest/{clientId}/sending/batches"

payload = {}
files=[

]
headers = {
   'accept': 'application/json',
   'content-type': 'multipart/form-data'
}

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

print(response.text)

// The batch was prepared successfully.
{
  "id": "",
  "campaignId": "",
  "recipientListId": "",
  "tag": "",
  "chunks": [
    ""
  ],
  "state": "",
  "links": [
    {
      "uriBuilder": {},
      "rels": [
        ""
      ],
      "rel": "",
      "type": "",
      "params": "",
      "title": "",
      "uri": ""
    }
  ]
}