curl --request PATCH \
  --url https://registry.wp-content.io/themes/{slug}/versions/{version} \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "release_notes": "Release notes for this version\n_Markdown is accepted_."
}
'

import requests

url = "https://registry.wp-content.io/themes/{slug}/versions/{version}"

payload = { "release_notes": "Release notes for this version
_Markdown is accepted_." }
headers = {
    "X-API-KEY": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {'X-API-KEY': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({release_notes: 'Release notes for this version\n_Markdown is accepted_.'})
};

fetch('https://registry.wp-content.io/themes/{slug}/versions/{version}', 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://registry.wp-content.io/themes/{slug}/versions/{version}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'release_notes' => 'Release notes for this version
_Markdown is accepted_.'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-KEY: <api-key>"
  ],
]);

$response = curl_exec($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://registry.wp-content.io/themes/{slug}/versions/{version}"

	payload := strings.NewReader("{\n  \"release_notes\": \"Release notes for this version\\n_Markdown is accepted_.\"\n}")

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

	req.Header.Add("X-API-KEY", "<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.patch("https://registry.wp-content.io/themes/{slug}/versions/{version}")
  .header("X-API-KEY", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"release_notes\": \"Release notes for this version\\n_Markdown is accepted_.\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://registry.wp-content.io/themes/{slug}/versions/{version}")

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

request = Net::HTTP::Patch.new(url)
request["X-API-KEY"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"release_notes\": \"Release notes for this version\\n_Markdown is accepted_.\"\n}"

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

{
  "version": "1.0.1",
  "release_notes": "Release notes for this version\n_Markdown is accepted_.",
  "download_link": "https://wp-content-staging.s3.fr-par.scw.cloud/artifacts/themes/my-theme/my-theme-1.0.1-2f5fafc05b11f83c15a8b72ce15609c8.zip",
  "checksum": "2f5fafc05b11f83c15a8b72ce15609c8",
  "latest": true
}

{
  "status": 404,
  "error": 404,
  "messages": {
    "error": "Not Found"
  }
}