curl --request POST \
  --url https://console.advinservers.com/api/v1/client/checkout/{uuid}/start \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "option": "paddle_once",
  "notes": null,
  "promo_code": null
}
'

import requests

url = "https://console.advinservers.com/api/v1/client/checkout/{uuid}/start"

payload = {
    "option": "paddle_once",
    "notes": None,
    "promo_code": None
}
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({option: 'paddle_once', notes: null, promo_code: null})
};

fetch('https://console.advinservers.com/api/v1/client/checkout/{uuid}/start', 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://console.advinservers.com/api/v1/client/checkout/{uuid}/start",
  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([
    'option' => 'paddle_once',
    'notes' => null,
    'promo_code' => null
  ]),
  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://console.advinservers.com/api/v1/client/checkout/{uuid}/start"

	payload := strings.NewReader("{\n  \"option\": \"paddle_once\",\n  \"notes\": null,\n  \"promo_code\": null\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://console.advinservers.com/api/v1/client/checkout/{uuid}/start")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"option\": \"paddle_once\",\n  \"notes\": null,\n  \"promo_code\": null\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://console.advinservers.com/api/v1/client/checkout/{uuid}/start")

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  \"option\": \"paddle_once\",\n  \"notes\": null,\n  \"promo_code\": null\n}"

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

{
  "uuid": "53a832f9-e85e-44b5-af03-2ef26110686d",
  "status": "awaiting_gateway",
  "status_label": "Waiting for payment",
  "progress_message": "Opening the payment form…",
  "last_error_code": null,
  "description": "Account credit · 25.00 USD",
  "line_items": [
    {
      "label": "Account credit",
      "amount": "25.00 USD"
    },
    {
      "label": "Added to your balance once the payment clears",
      "amount": null
    }
  ],
  "amount": "25.00",
  "currency": "USD",
  "total_display": "25.00 USD",
  "option": "paddle_once",
  "options": [
    {
      "value": "paddle_once",
      "label": "Credit Card or PayPal",
      "shortLabel": "Paddle",
      "description": "Pay once by card, PayPal or wallet. Nothing is stored and nothing renews by itself.",
      "provider": "paddle",
      "providerName": "Paddle",
      "recurring": false
    },
    {
      "value": "btcpay_once",
      "label": "Cryptocurrency (one-time payment)",
      "shortLabel": "BTCPay",
      "description": "Pay once in Bitcoin or another supported coin. Confirmations can take a few minutes.",
      "provider": "btcpay",
      "providerName": "BTCPay Server",
      "recurring": false
    }
  ],
  "merchant_of_record": true,
  "notes": null,
  "promo_code": null,
  "redirect_url": null,
  "paddle": {
    "transaction_id": "txn_01j8m4x7c2k9q5v3r6t1w8y0za",
    "client_token": "live_7d0b6c1f3e9a24c58b71e2f4d93",
    "environment": "production"
  },
  "return_path": "/add-funds",
  "expires_at": "2026-09-14T17:12:09+00:00",
  "settled_at": null,
  "created_at": "2026-09-14T16:42:09+00:00",
  "is_live": true,
  "can_choose": false,
  "is_settling": false,
  "paypal_account": "Paypal account",
  "enabled": true
}

{
  "message": "Unauthenticated."
}

{
  "message": "This API key is not allowed to do that in this team. It needs the \"snapshot.delete\" permission."
}

{
  "message": "Not found."
}

{
  "message": "The name field is required.",
  "errors": {}
}

{
  "message": "Too Many Attempts."
}