curl --request PATCH \
  --url https://{defaultHost}/v1/subscriptions/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subscription": {
    "quantity": 2
  }
}
'

import requests

url = "https://{defaultHost}/v1/subscriptions/{id}"

payload = { "subscription": { "quantity": 2 } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({subscription: {quantity: 2}})
};

fetch('https://{defaultHost}/v1/subscriptions/{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://{defaultHost}/v1/subscriptions/{id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'subscription' => [
        'quantity' => 2
    ]
  ]),
  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://{defaultHost}/v1/subscriptions/{id}"

	payload := strings.NewReader("{\n  \"subscription\": {\n    \"quantity\": 2\n  }\n}")

	req, _ := http.NewRequest("PATCH", 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.patch("https://{defaultHost}/v1/subscriptions/{id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"subscription\": {\n    \"quantity\": 2\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{defaultHost}/v1/subscriptions/{id}")

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

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"subscription\": {\n    \"quantity\": 2\n  }\n}"

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

{
  "id": "f2f5158c-58ec-41e9-b475-33425c3a4e2d",
  "object": "subscription",
  "ad_hoc_amount": null,
  "affiliation_expires_at": null,
  "cancel_at_period_end": false,
  "currency": "usd",
  "current_period_end_at": 1785077908,
  "current_period_start_at": 1782485908,
  "ended_at": null,
  "finite": false,
  "last_renewal_reminder_sent_at": null,
  "live_mode": true,
  "manual_payment": false,
  "metadata": {},
  "pending_update": {},
  "price_readonly": false,
  "portal_url": "http://app.example.com/portal_redirect/subscriptions/f2f5158c-58ec-41e9-b475-33425c3a4e2d",
  "quantity": 2,
  "remaining_period_count": null,
  "restart_on_completed": false,
  "restore_at": null,
  "subtotal_amount": 5800,
  "status": "active",
  "tax_enabled": false,
  "trial_end_at": null,
  "trial_start_at": null,
  "variant_options": null,
  "affiliation": null,
  "current_cancellation_act": null,
  "current_period": "1a5824b3-e579-4d1f-ae52-511304ceafc8",
  "customer": "53c4e68c-bb54-4dff-b779-c6edd4b6e44d",
  "discount": null,
  "manual_payment_method": null,
  "payment_method": "83e8d9c1-fdc7-4b12-832b-f1c66cda1a18",
  "price": "92f97189-87a8-42e7-8e7e-7bd003ec029e",
  "purchase": "8cb38565-f8f2-456f-8292-08428ce757d0",
  "shipping_method": null,
  "variant": null,
  "created_at": 1782485908,
  "updated_at": 1782485908
}