curl --request PUT \
  --url https://{host}/api/public/v1/invoices/{id}/status \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "status": "unpaid"
}
'

import requests

url = "https://{host}/api/public/v1/invoices/{id}/status"

payload = { "status": "unpaid" }
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({status: 'unpaid'})
};

fetch('https://{host}/api/public/v1/invoices/{id}/status', 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://{host}/api/public/v1/invoices/{id}/status",
  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([
    'status' => 'unpaid'
  ]),
  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://{host}/api/public/v1/invoices/{id}/status"

	payload := strings.NewReader("{\n  \"status\": \"unpaid\"\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://{host}/api/public/v1/invoices/{id}/status")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"status\": \"unpaid\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{host}/api/public/v1/invoices/{id}/status")

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  \"status\": \"unpaid\"\n}"

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

{
  "data": {
    "id": 123,
    "document_type": "invoice",
    "document_number": "<string>",
    "document_date": "<string>",
    "document_due_date": "<string>",
    "status": "<string>",
    "status_name": "<string>",
    "currency": "<string>",
    "contact": {
      "id": 123,
      "contact_number": "<string>",
      "company_name": "<string>",
      "first_name": "<string>",
      "last_name": "<string>",
      "email": "<string>",
      "phone": "<string>",
      "lifecycle_stage": "lead",
      "status": "<string>",
      "status_name": "<string>",
      "user": {
        "id": 123,
        "name": "<string>",
        "email": "<string>"
      },
      "groups": [
        {}
      ],
      "primary_address": {
        "id": 123,
        "name": "<string>",
        "attention": "<string>",
        "email": "<string>",
        "company_name": "<string>",
        "mobile_no": "<string>",
        "office_no": "<string>",
        "address1": "<string>",
        "address2": "<string>",
        "city": "<string>",
        "state": "<string>",
        "postcode": "<string>",
        "country": "<string>",
        "country_name": "<string>",
        "zone_id": 123,
        "is_primary": true
      },
      "works_count": 123,
      "quotations_count": 123,
      "invoices_count": 123,
      "created_at": "<string>",
      "updated_at": "<string>"
    },
    "sub_total": 123,
    "total_discount": 123,
    "total_tax": 123,
    "total_amount": 123,
    "final_amount": 123,
    "amount_paid": 123,
    "remaining_amount": 123,
    "pdf_url": "<string>",
    "remarks": "<string>",
    "items": [
      {}
    ],
    "taxes": [
      {}
    ],
    "discounts": [
      {}
    ],
    "addresses": {
      "billing": {},
      "shipping": {}
    },
    "created_at": "<string>",
    "updated_at": "<string>"
  }
}

{
  "error": {
    "code": "invalid_api_key",
    "message": "The API key is invalid, revoked, or expired."
  }
}

{
  "error": {
    "code": "insufficient_scope",
    "message": "This API key does not have the required scope."
  }
}

{
  "error": {
    "code": "not_found",
    "message": "The requested resource was not found."
  }
}

{
  "error": {
    "code": "validation_failed",
    "message": "The attention field is required.",
    "fields": {
      "attention": [
        "The attention field is required."
      ]
    }
  }
}