curl -X POST https://verification.didit.me/v3/travel-rule/pickup/{token}/messages/ \
  -H 'Content-Type: application/json' \
  -d '{"kind": "MESSAGE", "body": "Attached is the proof of address of the wallet holder."}'

import requests

url = "https://verification.didit.me/v3/travel-rule/pickup/{token}/messages/"

payload = {
    "kind": "MESSAGE",
    "body": "Attached is the proof of address of the wallet holder."
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    kind: 'MESSAGE',
    body: JSON.stringify('Attached is the proof of address of the wallet holder.')
  })
};

fetch('https://verification.didit.me/v3/travel-rule/pickup/{token}/messages/', 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://verification.didit.me/v3/travel-rule/pickup/{token}/messages/",
  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([
    'kind' => 'MESSAGE',
    'body' => 'Attached is the proof of address of the wallet holder.'
  ]),
  CURLOPT_HTTPHEADER => [
    "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://verification.didit.me/v3/travel-rule/pickup/{token}/messages/"

	payload := strings.NewReader("{\n  \"kind\": \"MESSAGE\",\n  \"body\": \"Attached is the proof of address of the wallet holder.\"\n}")

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

	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://verification.didit.me/v3/travel-rule/pickup/{token}/messages/")
  .header("Content-Type", "application/json")
  .body("{\n  \"kind\": \"MESSAGE\",\n  \"body\": \"Attached is the proof of address of the wallet holder.\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://verification.didit.me/v3/travel-rule/pickup/{token}/messages/")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"kind\": \"MESSAGE\",\n  \"body\": \"Attached is the proof of address of the wallet holder.\"\n}"

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

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "kind": "MESSAGE",
  "direction": "INBOUND",
  "author": "<string>",
  "body": "<string>",
  "requested_documents": [
    "<string>"
  ],
  "reply_to": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "fulfilled_at": "2023-11-07T05:31:56Z",
  "attachment": {
    "uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "label": "<string>",
    "note": "<string>",
    "uploaded_by": "<string>",
    "created_at": "2023-11-07T05:31:56Z",
    "files": [
      {
        "uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "file_url": "<string>",
        "original_filename": "<string>",
        "file_size": 123
      }
    ]
  },
  "created_at": "2023-11-07T05:31:56Z"
}

{
  "requested_documents": [
    "Name at least one document the counterparty should send."
  ]
}