Update a custom mailing template

curl --request PUT \
  --url https://api.gratona.com/v1/admin/mailing_templates/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Education impact letter",
  "scope_type": "donor",
  "preset_key": "<string>",
  "render_strategy": "unlayer_pdf",
  "description": "<string>",
  "is_active": true,
  "program_ids": [
    42
  ],
  "documents": [
    {
      "document_kind": "letter",
      "page_preset": "us_letter_portrait",
      "editor_mode": "unlayer",
      "html": "<p>Dear [donor_name], thank you.</p>",
      "design": "<unknown>",
      "settings_json": {}
    }
  ]
}
'

import requests

url = "https://api.gratona.com/v1/admin/mailing_templates/{id}"

payload = {
    "name": "Education impact letter",
    "scope_type": "donor",
    "preset_key": "<string>",
    "render_strategy": "unlayer_pdf",
    "description": "<string>",
    "is_active": True,
    "program_ids": [42],
    "documents": [
        {
            "document_kind": "letter",
            "page_preset": "us_letter_portrait",
            "editor_mode": "unlayer",
            "html": "<p>Dear [donor_name], thank you.</p>",
            "design": "<unknown>",
            "settings_json": {}
        }
    ]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'Education impact letter',
    scope_type: 'donor',
    preset_key: '<string>',
    render_strategy: 'unlayer_pdf',
    description: '<string>',
    is_active: true,
    program_ids: [42],
    documents: [
      {
        document_kind: 'letter',
        page_preset: 'us_letter_portrait',
        editor_mode: 'unlayer',
        html: '<p>Dear [donor_name], thank you.</p>',
        design: '<unknown>',
        settings_json: {}
      }
    ]
  })
};

fetch('https://api.gratona.com/v1/admin/mailing_templates/{id}', 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/admin/mailing_templates/{id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => 'Education impact letter',
    'scope_type' => 'donor',
    'preset_key' => '<string>',
    'render_strategy' => 'unlayer_pdf',
    'description' => '<string>',
    'is_active' => true,
    'program_ids' => [
        42
    ],
    'documents' => [
        [
                'document_kind' => 'letter',
                'page_preset' => 'us_letter_portrait',
                'editor_mode' => 'unlayer',
                'html' => '<p>Dear [donor_name], thank you.</p>',
                'design' => '<unknown>',
                'settings_json' => [
                                
                ]
        ]
    ]
  ]),
  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.gratona.com/v1/admin/mailing_templates/{id}"

	payload := strings.NewReader("{\n  \"name\": \"Education impact letter\",\n  \"scope_type\": \"donor\",\n  \"preset_key\": \"<string>\",\n  \"render_strategy\": \"unlayer_pdf\",\n  \"description\": \"<string>\",\n  \"is_active\": true,\n  \"program_ids\": [\n    42\n  ],\n  \"documents\": [\n    {\n      \"document_kind\": \"letter\",\n      \"page_preset\": \"us_letter_portrait\",\n      \"editor_mode\": \"unlayer\",\n      \"html\": \"<p>Dear [donor_name], thank you.</p>\",\n      \"design\": \"<unknown>\",\n      \"settings_json\": {}\n    }\n  ]\n}")

	req, _ := http.NewRequest("PUT", 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.put("https://api.gratona.com/v1/admin/mailing_templates/{id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Education impact letter\",\n  \"scope_type\": \"donor\",\n  \"preset_key\": \"<string>\",\n  \"render_strategy\": \"unlayer_pdf\",\n  \"description\": \"<string>\",\n  \"is_active\": true,\n  \"program_ids\": [\n    42\n  ],\n  \"documents\": [\n    {\n      \"document_kind\": \"letter\",\n      \"page_preset\": \"us_letter_portrait\",\n      \"editor_mode\": \"unlayer\",\n      \"html\": \"<p>Dear [donor_name], thank you.</p>\",\n      \"design\": \"<unknown>\",\n      \"settings_json\": {}\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gratona.com/v1/admin/mailing_templates/{id}")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"Education impact letter\",\n  \"scope_type\": \"donor\",\n  \"preset_key\": \"<string>\",\n  \"render_strategy\": \"unlayer_pdf\",\n  \"description\": \"<string>\",\n  \"is_active\": true,\n  \"program_ids\": [\n    42\n  ],\n  \"documents\": [\n    {\n      \"document_kind\": \"letter\",\n      \"page_preset\": \"us_letter_portrait\",\n      \"editor_mode\": \"unlayer\",\n      \"html\": \"<p>Dear [donor_name], thank you.</p>\",\n      \"design\": \"<unknown>\",\n      \"settings_json\": {}\n    }\n  ]\n}"

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

{
  "data": {
    "id": 42,
    "name": "Education impact letter",
    "scope_type": "donor",
    "template_kind": "custom",
    "preset_key": "Example",
    "render_strategy": "unlayer_pdf",
    "description": "Example",
    "is_active": true,
    "program_ids": [
      42
    ],
    "program_bindings": [
      {
        "id": 42,
        "program_id": 42,
        "name": "Example"
      }
    ],
    "applicability_label": "Client-wide",
    "documents": [
      {
        "id": 42,
        "document_kind": "letter",
        "page_preset": "us_letter_portrait",
        "editor_mode": "unlayer",
        "html": "<p>Dear [donor_name], thank you for your support.</p>",
        "design": "{`body`:{}}",
        "settings_json": {}
      }
    ],
    "has_labels": true,
    "created_at": "2026-10-20T12:00:00Z",
    "updated_at": "2026-10-20T12:00:00Z"
  }
}

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

{
  "message": "Not Found",
  "status": "error"
}

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