curl --request POST \
  --url https://api.proposales.com/v3/proposals/{uuid} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "company_id": 123,
  "language": "<string>",
  "title_md": "<string>",
  "description_md": "<string>",
  "recipient": {},
  "contact_email": "<string>",
  "data": {},
  "blocks": [
    {}
  ],
  "attachments": [
    {}
  ],
  "background_image": {},
  "background_video": {},
  "invoicing_enabled": true,
  "invoicing": {},
  "tax_options": {}
}
'

import requests

url = "https://api.proposales.com/v3/proposals/{uuid}"

payload = {
    "company_id": 123,
    "language": "<string>",
    "title_md": "<string>",
    "description_md": "<string>",
    "recipient": {},
    "contact_email": "<string>",
    "data": {},
    "blocks": [{}],
    "attachments": [{}],
    "background_image": {},
    "background_video": {},
    "invoicing_enabled": True,
    "invoicing": {},
    "tax_options": {}
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    company_id: 123,
    language: '<string>',
    title_md: '<string>',
    description_md: '<string>',
    recipient: {},
    contact_email: '<string>',
    data: {},
    blocks: [{}],
    attachments: [{}],
    background_image: {},
    background_video: {},
    invoicing_enabled: true,
    invoicing: {},
    tax_options: {}
  })
};

fetch('https://api.proposales.com/v3/proposals/{uuid}', 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.proposales.com/v3/proposals/{uuid}",
  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([
    'company_id' => 123,
    'language' => '<string>',
    'title_md' => '<string>',
    'description_md' => '<string>',
    'recipient' => [
        
    ],
    'contact_email' => '<string>',
    'data' => [
        
    ],
    'blocks' => [
        [
                
        ]
    ],
    'attachments' => [
        [
                
        ]
    ],
    'background_image' => [
        
    ],
    'background_video' => [
        
    ],
    'invoicing_enabled' => true,
    'invoicing' => [
        
    ],
    'tax_options' => [
        
    ]
  ]),
  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.proposales.com/v3/proposals/{uuid}"

	payload := strings.NewReader("{\n  \"company_id\": 123,\n  \"language\": \"<string>\",\n  \"title_md\": \"<string>\",\n  \"description_md\": \"<string>\",\n  \"recipient\": {},\n  \"contact_email\": \"<string>\",\n  \"data\": {},\n  \"blocks\": [\n    {}\n  ],\n  \"attachments\": [\n    {}\n  ],\n  \"background_image\": {},\n  \"background_video\": {},\n  \"invoicing_enabled\": true,\n  \"invoicing\": {},\n  \"tax_options\": {}\n}")

	req, _ := http.NewRequest("POST", 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.post("https://api.proposales.com/v3/proposals/{uuid}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"company_id\": 123,\n  \"language\": \"<string>\",\n  \"title_md\": \"<string>\",\n  \"description_md\": \"<string>\",\n  \"recipient\": {},\n  \"contact_email\": \"<string>\",\n  \"data\": {},\n  \"blocks\": [\n    {}\n  ],\n  \"attachments\": [\n    {}\n  ],\n  \"background_image\": {},\n  \"background_video\": {},\n  \"invoicing_enabled\": true,\n  \"invoicing\": {},\n  \"tax_options\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.proposales.com/v3/proposals/{uuid}")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"company_id\": 123,\n  \"language\": \"<string>\",\n  \"title_md\": \"<string>\",\n  \"description_md\": \"<string>\",\n  \"recipient\": {},\n  \"contact_email\": \"<string>\",\n  \"data\": {},\n  \"blocks\": [\n    {}\n  ],\n  \"attachments\": [\n    {}\n  ],\n  \"background_image\": {},\n  \"background_video\": {},\n  \"invoicing_enabled\": true,\n  \"invoicing\": {},\n  \"tax_options\": {}\n}"

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

{
  "proposal": {
    "uuid": "<string>",
    "url": "<string>"
  }
}