curl -X POST https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply \
  -u "YOUR_UUID:YOUR_SECRET" \
  -H "idempotency-Key: cn-req-apply-004" \
  -H "X-API-Version: 1.2" \
  -H "Content-Type: application/json" \
  -d '{
  "amount": 15,
  "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
  "notes": "Applying partial credit to invoice INV-4717"
}'

const response = await fetch("https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply", {
  method: "POST",
  headers: {
    Authorization: "Basic " + Buffer.from("YOUR_UUID:YOUR_SECRET").toString("base64"),
    "idempotency-Key": "cn-req-apply-004",
    "X-API-Version": "1.2",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "amount": 15,
    "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
    "notes": "Applying partial credit to invoice INV-4717"
  }),
});

const data = await response.json();
console.log(data);

import requests

response = requests.post(
    "https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply",
    auth=("YOUR_UUID", "YOUR_SECRET"),
    headers={
        "idempotency-Key": "cn-req-apply-004",
        "X-API-Version": "1.2",
    },
    json={
        "amount": 15,
        "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
        "notes": "Applying partial credit to invoice INV-4717",
    },
)

print(response.json())

require "net/http"
require "json"
require "uri"

uri = URI("https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply")
request = Net::HTTP::Post.new(uri)
request.basic_auth("YOUR_UUID", "YOUR_SECRET")
request["idempotency-Key"] = "cn-req-apply-004"
request["X-API-Version"] = "1.2"
request["Content-Type"] = "application/json"
request.body = <<~JSON
  {
    "amount": 15,
    "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
    "notes": "Applying partial credit to invoice INV-4717"
  }
JSON

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts JSON.parse(response.body)

<?php

$ch = curl_init("https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply");

curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_USERPWD => "YOUR_UUID:YOUR_SECRET",
    CURLOPT_HTTPHEADER => [
        "idempotency-Key: cn-req-apply-004",
        "X-API-Version: 1.2",
        "Content-Type: application/json",
    ],
    CURLOPT_POSTFIELDS => <<<'JSON'
{
  "amount": 15,
  "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
  "notes": "Applying partial credit to invoice INV-4717"
}
JSON,
]);

$response = curl_exec($ch);
curl_close($ch);

print_r(json_decode($response, true));

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.Base64;

public class Example {
    public static void main(String[] args) throws Exception {
        String credentials = Base64.getEncoder()
            .encodeToString("YOUR_UUID:YOUR_SECRET".getBytes());

        String body = String.join("\n",
            "{",
            "  \"amount\": 15,",
            "  \"invoice_id\": \"669dc683-4ad1-4971-a743-90d908788f01\",",
            "  \"notes\": \"Applying partial credit to invoice INV-4717\"",
            "}"
        );

        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply"))
            .header("Authorization", "Basic " + credentials)
            .header("idempotency-Key", "cn-req-apply-004")
            .header("X-API-Version", "1.2")
            .header("Content-Type", "application/json")
            .method("POST", HttpRequest.BodyPublishers.ofString(body))
            .build();

        HttpResponse<String> response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());

        System.out.println(response.body());
    }
}

package main

import (
	"fmt"
	"io"
	"net/http"
	"strings"
)

func main() {
	body := strings.NewReader(`{
  "amount": 15,
  "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
  "notes": "Applying partial credit to invoice INV-4717"
}`)

	req, err := http.NewRequest("POST", "https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply", body)
	if err != nil {
		panic(err)
	}
	req.SetBasicAuth("YOUR_UUID", "YOUR_SECRET")
	req.Header.Set("idempotency-Key", "cn-req-apply-004")
	req.Header.Set("X-API-Version", "1.2")
	req.Header.Set("Content-Type", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	data, _ := io.ReadAll(res.Body)
	fmt.Println(string(data))
}

using System.Net.Http.Headers;
using System.Text;

using var client = new HttpClient();

var request = new HttpRequestMessage(HttpMethod.Post, "https://qa-payments.mygigsters.com.au/api/v1/credit-notes/1/apply");
request.Headers.Authorization = new AuthenticationHeaderValue(
    "Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes("YOUR_UUID:YOUR_SECRET")));
request.Headers.Add("idempotency-Key", "cn-req-apply-004");
request.Headers.Add("X-API-Version", "1.2");
request.Content = new StringContent(@"{
  ""amount"": 15,
  ""invoice_id"": ""669dc683-4ad1-4971-a743-90d908788f01"",
  ""notes"": ""Applying partial credit to invoice INV-4717""
}", Encoding.UTF8, "application/json");

var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());

{
  "success": true,
  "message": "Credit note applied successfully",
  "data": {
    "allocation": {
      "id": 2,
      "credit_note_id": 1,
      "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
      "amount": "15.00",
      "notes": "Applying partial credit to invoice INV-4717",
      "updated_at": "2026-09-16T06:12:17.504Z",
      "created_at": "2026-09-16T06:12:17.504Z"
    },
    "credit_note": {
      "id": 1,
      "credit_note_number": "CN-0001",
      "client_id": "4407c3ba-10c9-4822-9f51-c2c96692f8d7",
      "customer_id": "4407c3ba-10c9-4822-9f51-c2c96692f8d7",
      "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
      "invoice_number": "INV-4717",
      "payment_id": null,
      "total_amount": "50.00",
      "remaining_amount": "10.00",
      "applied_amount": "40.00",
      "currency": "AUD",
      "status": "PARTIALLY_APPLIED",
      "reason": "Customer discount / Service dispute",
      "description": "50 AUD credit issued for overbilled service hours",
      "date": "2026-09-16T05:51:09.000Z",
      "deleted_at": null,
      "created_at": "2026-09-16T05:51:09.000Z",
      "updated_at": "2026-09-16T06:12:17.626Z"
    },
    "invoice": {
      "invoice_id": "669dc683-4ad1-4971-a743-90d908788f01",
      "invoice_number": "INV-4717",
      "total_amount": "330",
      "currency": "AUD"
    }
  }
}