curl --request POST \
  --url https://api.yorlet.com/v1/letter_templates/{id} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "address_position": "left",
  "blocks": [
    {
      "type": "heading",
      "content": "<string>"
    }
  ],
  "description": "<string>",
  "name": "<string>",
  "recipient_type": "customer",
  "variables": []
}
'

import requests

url = "https://api.yorlet.com/v1/letter_templates/{id}"

payload = {
    "address_position": "left",
    "blocks": [
        {
            "type": "heading",
            "content": "<string>"
        }
    ],
    "description": "<string>",
    "name": "<string>",
    "recipient_type": "customer",
    "variables": []
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    address_position: 'left',
    blocks: [{type: 'heading', content: '<string>'}],
    description: '<string>',
    name: '<string>',
    recipient_type: 'customer',
    variables: []
  })
};

fetch('https://api.yorlet.com/v1/letter_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.yorlet.com/v1/letter_templates/{id}",
  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([
    'address_position' => 'left',
    'blocks' => [
        [
                'type' => 'heading',
                'content' => '<string>'
        ]
    ],
    'description' => '<string>',
    'name' => '<string>',
    'recipient_type' => 'customer',
    'variables' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "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.yorlet.com/v1/letter_templates/{id}"

	payload := strings.NewReader("{\n  \"address_position\": \"left\",\n  \"blocks\": [\n    {\n      \"type\": \"heading\",\n      \"content\": \"<string>\"\n    }\n  ],\n  \"description\": \"<string>\",\n  \"name\": \"<string>\",\n  \"recipient_type\": \"customer\",\n  \"variables\": []\n}")

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

	req.Header.Add("Authorization", "<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.yorlet.com/v1/letter_templates/{id}")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"address_position\": \"left\",\n  \"blocks\": [\n    {\n      \"type\": \"heading\",\n      \"content\": \"<string>\"\n    }\n  ],\n  \"description\": \"<string>\",\n  \"name\": \"<string>\",\n  \"recipient_type\": \"customer\",\n  \"variables\": []\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.yorlet.com/v1/letter_templates/{id}")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"address_position\": \"left\",\n  \"blocks\": [\n    {\n      \"type\": \"heading\",\n      \"content\": \"<string>\"\n    }\n  ],\n  \"description\": \"<string>\",\n  \"name\": \"<string>\",\n  \"recipient_type\": \"customer\",\n  \"variables\": []\n}"

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

{
  "id": "<string>",
  "created": 123,
  "object": "letter_template",
  "address_position": "left",
  "blocks": [
    {
      "type": "heading",
      "content": "<string>"
    }
  ],
  "description": "<string>",
  "merge_fields": [
    "<string>"
  ],
  "name": "<string>",
  "recipient_type": "any",
  "variables": [
    {
      "key": "<string>",
      "label": "<string>"
    }
  ],
  "account": "<string>",
  "deleted": false
}