Quick Start

Before you begin

You need an ElasticPay account and sandbox API keys. Find them in Settings > API Keys in the dashboard. Keys come in two types: secret (sk_sandbox_...) for server-side use and publishable (pk_sandbox_...) for client-side use.

Create a payment intent

A payment intent represents a single payment attempt. Create one server-side with an amount (in cents) and currency.

cURL

curl -X POST https://api.elasticpay.co/api/v1/payment_intents \
  -H "Authorization: Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"amount": 2000, "currency": "AUD"}'

Node.js

const response = await fetch('https://api.elasticpay.co/api/v1/payment_intents', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ amount: 2000, currency: 'AUD' }),
});
const pi = await response.json();
console.log(pi.id);            // pi_0abc123...
console.log(pi.client_secret); // pass to the widget

Python

import requests

response = requests.post(
    'https://api.elasticpay.co/api/v1/payment_intents',
    headers={'Authorization': 'Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'},
    json={'amount': 2000, 'currency': 'AUD'},
)
pi = response.json()
print(pi['id'])            # pi_0abc123...
print(pi['client_secret']) # pass to the widget

PHP

<?php
use GuzzleHttp\Client;

$client = new Client([
    'base_uri' => 'https://api.elasticpay.co',
    'headers'  => [
        'Authorization' => 'Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
        'Content-Type'  => 'application/json',
    ],
]);

$response = $client->post('/api/v1/payment_intents', [
    'json' => ['amount' => 2000, 'currency' => 'AUD'],
]);
$pi = json_decode($response->getBody(), true);
echo $pi['id'];            // pi_0abc123...
echo $pi['client_secret']; // pass to the widget

Ruby

require 'faraday'
require 'json'

conn = Faraday.new('https://api.elasticpay.co') do |f|
  f.request  :json
  f.response :json
end
conn.headers['Authorization'] = 'Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
conn.headers['Content-Type']  = 'application/json'

res = conn.post('/api/v1/payment_intents') { |r| r.body = { amount: 2000, currency: 'AUD' } }
pi  = res.body
puts pi['id']            # pi_0abc123...
puts pi['client_secret'] # pass to the widget

C#

using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Http.Json;

using var http = new HttpClient { BaseAddress = new Uri("https://api.elasticpay.co") };
http.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", "sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

var response = await http.PostAsJsonAsync(
    "/api/v1/payment_intents",
    new { amount = 2000, currency = "AUD" });
var pi = await response.Content.ReadFromJsonAsync<JsonDocument>();
Console.WriteLine(pi.RootElement.GetProperty("id").GetString());
Console.WriteLine(pi.RootElement.GetProperty("client_secret").GetString());

Response:

{
  "id": "pi_0abc123def456ghi789jkl012mn",
  "amount": 2000,
  "currency": "AUD",
  "status": "requires_payment_method",
  "client_secret": "pi_0abc123def456ghi789jkl012mn_secret_xyz987",
  "livemode": false,
  "created_at": "2025-01-15T10:00:00Z"
}

The client_secret is passed to the widget to collect card details. Keep the payment intent id on your server.

Tip

Minimum amount is 200 cents. Supported currencies: AUD, NZD, USD, EUR, GBP, JPY.

Confirm the payment

After the widget tokenises the card and returns a pm_xxx, confirm the payment:

cURL

curl -X POST https://api.elasticpay.co/api/v1/payment_intents/pi_0abc123def456/confirm \
  -H "Authorization: Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{"payment_method": "pm_0xyz789abc123def456ghi012jkl"}'

Node.js

const res = await fetch(
  'https://api.elasticpay.co/api/v1/payment_intents/pi_0abc123def456/confirm',
  {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({ payment_method: 'pm_0xyz789abc123def456ghi012jkl' }),
  }
);
const result = await res.json();
console.log(result.status); // 'succeeded'

Python

result = requests.post(
    'https://api.elasticpay.co/api/v1/payment_intents/pi_0abc123def456/confirm',
    headers={'Authorization': 'Bearer sk_sandbox_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'},
    json={'payment_method': 'pm_0xyz789abc123def456ghi012jkl'},
).json()
print(result['status'])  # 'succeeded'

PHP

$result = json_decode($client->post(
    '/api/v1/payment_intents/pi_0abc123def456/confirm',
    ['json' => ['payment_method' => 'pm_0xyz789abc123def456ghi012jkl']]
)->getBody(), true);
echo $result['status']; // 'succeeded'

Ruby

res = conn.post('/api/v1/payment_intents/pi_0abc123def456/confirm') do |r|
  r.body = { payment_method: 'pm_0xyz789abc123def456ghi012jkl' }
end
puts res.body['status'] # 'succeeded'

C#

var confirm = await http.PostAsJsonAsync(
    "/api/v1/payment_intents/pi_0abc123def456/confirm",
    new { payment_method = "pm_0xyz789abc123def456ghi012jkl" });
var result = await confirm.Content.ReadFromJsonAsync<JsonDocument>();
Console.WriteLine(result.RootElement.GetProperty("status").GetString()); // succeeded

A status of succeeded means the payment is complete. For async processing you may see processing — listen for the payment_intent.succeeded webhook as the authoritative signal.

Next steps

• Authentication — key types and how to send them
• Accept a Payment — full integration guide
• Webhooks — receive real-time payment events