curl --request POST \
  --url https://api.example.com/v0/records/batch \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    "<unknown>"
  ]
}
'

import requests

url = "https://api.example.com/v0/records/batch"

payload = { "items": ["<unknown>"] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({items: ['<unknown>']})
};

fetch('https://api.example.com/v0/records/batch', 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.example.com/v0/records/batch",
  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([
    'items' => [
        '<unknown>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "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.example.com/v0/records/batch"

	payload := strings.NewReader("{\n  \"items\": [\n    \"<unknown>\"\n  ]\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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.example.com/v0/records/batch")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"items\": [\n    \"<unknown>\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/v0/records/batch")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"items\": [\n    \"<unknown>\"\n  ]\n}"

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

{
  "items": [
    {
      "index": 1,
      "receipt": {
        "receipt_id": "<string>",
        "state": "pending",
        "diagnostics": [
          {
            "code": "<string>",
            "message": "<string>",
            "retryable": true,
            "field": "<string>",
            "resync_url": "<string>"
          }
        ],
        "source": {
          "corpus_id": "<string>",
          "namespace": "<string>",
          "record_key": "<string>"
        },
        "processing": {
          "state": "queued",
          "phase": "materialization",
          "message": "<string>"
        },
        "outcome": "created",
        "record_id": "<string>",
        "version_id": "<string>",
        "availability": {
          "state": "materialized",
          "is_current": true,
          "searchable": true
        }
      },
      "error": {
        "code": "<string>",
        "message": "<string>",
        "retryable": true,
        "field": "<string>",
        "resync_url": "<string>"
      }
    }
  ]
}

{
  "code": "<string>",
  "message": "<string>",
  "retryable": true,
  "field": "<string>",
  "resync_url": "<string>"
}