Send a new message from the recipient to a donor

curl --request POST \
  --url https://api.gratona.com/v1/frontend/recipient-portal/{client_id}/{session_id}/messages \
  --header 'Content-Type: application/json' \
  --header 'session_id: <api-key>' \
  --data '
{
  "donor_id": 12345,
  "subject": "Thank you!",
  "message": "Dear sponsor, ...",
  "fileName": "thank-you.pdf",
  "fileStorageKey": "recipient-portal/2026/04/abcd-ef01.pdf",
  "uploadReceipt": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

import requests

url = "https://api.gratona.com/v1/frontend/recipient-portal/{client_id}/{session_id}/messages"

payload = {
    "donor_id": 12345,
    "subject": "Thank you!",
    "message": "Dear sponsor, ...",
    "fileName": "thank-you.pdf",
    "fileStorageKey": "recipient-portal/2026/04/abcd-ef01.pdf",
    "uploadReceipt": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
headers = {
    "session_id": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {session_id: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    donor_id: 12345,
    subject: 'Thank you!',
    message: 'Dear sponsor, ...',
    fileName: 'thank-you.pdf',
    fileStorageKey: 'recipient-portal/2026/04/abcd-ef01.pdf',
    uploadReceipt: '3c90c3cc-0d44-4b50-8888-8dd25736052a'
  })
};

fetch('https://api.gratona.com/v1/frontend/recipient-portal/{client_id}/{session_id}/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://api.gratona.com/v1/frontend/recipient-portal/{client_id}/{session_id}/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([
    'donor_id' => 12345,
    'subject' => 'Thank you!',
    'message' => 'Dear sponsor, ...',
    'fileName' => 'thank-you.pdf',
    'fileStorageKey' => 'recipient-portal/2026/04/abcd-ef01.pdf',
    'uploadReceipt' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "session_id: <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://api.gratona.com/v1/frontend/recipient-portal/{client_id}/{session_id}/messages"

	payload := strings.NewReader("{\n  \"donor_id\": 12345,\n  \"subject\": \"Thank you!\",\n  \"message\": \"Dear sponsor, ...\",\n  \"fileName\": \"thank-you.pdf\",\n  \"fileStorageKey\": \"recipient-portal/2026/04/abcd-ef01.pdf\",\n  \"uploadReceipt\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}")

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

	req.Header.Add("session_id", "<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.post("https://api.gratona.com/v1/frontend/recipient-portal/{client_id}/{session_id}/messages")
  .header("session_id", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"donor_id\": 12345,\n  \"subject\": \"Thank you!\",\n  \"message\": \"Dear sponsor, ...\",\n  \"fileName\": \"thank-you.pdf\",\n  \"fileStorageKey\": \"recipient-portal/2026/04/abcd-ef01.pdf\",\n  \"uploadReceipt\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gratona.com/v1/frontend/recipient-portal/{client_id}/{session_id}/messages")

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

request = Net::HTTP::Post.new(url)
request["session_id"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"donor_id\": 12345,\n  \"subject\": \"Thank you!\",\n  \"message\": \"Dear sponsor, ...\",\n  \"fileName\": \"thank-you.pdf\",\n  \"fileStorageKey\": \"recipient-portal/2026/04/abcd-ef01.pdf\",\n  \"uploadReceipt\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}"

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

{
  "status": "success",
  "message": {
    "id": 123,
    "status": "pending_approval"
  }
}

{
  "message": "Unauthorized",
  "status": "error"
}

{
  "message": "Something went wrong. Please try again.",
  "status": "error",
  "error": "invalid_request",
  "code": "DONOR_NOT_FOUND"
}

{
  "errors": {},
  "status": "error",
  "message": "The given data was invalid."
}