WP SmartPay exposes a REST API under the /wp-json/smartpay/v1/ namespace. You can use it to read payments, customers, forms, and subscriptions from external applications — dashboards, mobile apps, or custom integrations.

Authentication

All API requests require authentication. Use WordPress Application Passwords (WordPress 5.6+):

  1. Go to WordPress Admin → Users → Profile → Application Passwords.
  2. Enter a name for the password (e.g., "My App") and click Add New Application Password.
  3. Copy the generated password — it won't be shown again.
  4. Authenticate using HTTP Basic Auth: Authorization: Basic base64(username:password).

For server-side integrations, you can also use a WordPress nonce (X-WP-Nonce) when making requests from within WordPress (e.g., from JavaScript in the admin).

Endpoints

Payments

MethodEndpointDescription
GET /wp-json/smartpay/v1/payments List payments. Supports: ?status=completed, ?page=1, ?per_page=20, ?from=2026-01-01, ?to=2026-07-28
GET /wp-json/smartpay/v1/payments/{id} Get a single payment by ID

Payment Response Fields

{
  "id": 1234,
  "key": "sp_abc123",
  "amount": 4900,
  "currency": "USD",
  "status": "completed",
  "gateway": "stripe",
  "mode": "live",
  "email": "[email protected]",
  "customer_id": 56,
  "form_id": 5,
  "form_title": "UI Kit",
  "created_at": "2026-07-28T10:23:00Z",
  "updated_at": "2026-07-28T10:23:05Z"
}

Customers

MethodEndpointDescription
GET /wp-json/smartpay/v1/customers List customers
GET /wp-json/smartpay/v1/customers/{id} Get a single customer

Subscriptions (Pro)

MethodEndpointDescription
GET /wp-json/smartpay-pro/v1/subscriptions List subscriptions
GET /wp-json/smartpay-pro/v1/subscriptions/{id} Get a single subscription

Forms

MethodEndpointDescription
GET /wp-json/smartpay/v1/forms List payment forms
GET /wp-json/smartpay/v1/forms/{id} Get a single form

Example Requests

List completed payments (curl)

curl -X GET \
  "https://yoursite.com/wp-json/smartpay/v1/payments?status=completed&per_page=50" \
  -H "Authorization: Basic $(echo -n 'admin:xxxx xxxx xxxx xxxx xxxx xxxx' | base64)"

Get a payment by ID (JavaScript fetch)

const response = await fetch(
  'https://yoursite.com/wp-json/smartpay/v1/payments/1234',
  {
    headers: {
      'X-WP-Nonce': wpApiSettings.nonce,
    },
  }
);
const payment = await response.json();

Extending the REST API

You can register custom endpoints under the SmartPay namespace from your plugin:

add_action( 'rest_api_init', function() {
    register_rest_route( 'smartpay/v1', '/custom-report', [
        'methods'             => WP_REST_Server::READABLE,
        'callback'            => 'my_custom_report_handler',
        'permission_callback' => function() {
            return current_user_can( 'manage_options' );
        },
    ]);
});

function my_custom_report_handler( WP_REST_Request $request ) {
    // Your custom report logic
    return rest_ensure_response( [ 'total' => 1234 ] );
}

Notes

  • Amounts are returned in the smallest currency unit — for USD, $49.00 is returned as 4900 (cents). Always divide by 100 for USD, EUR, GBP; some currencies (JPY) have no minor unit.
  • The API requires an active SmartPay Pro license for Pro endpoints (smartpay-pro/v1/).
  • All list endpoints support pagination via ?page=N&per_page=N. Default page size is 20.
  • Date filtering uses ISO 8601 format: ?from=2026-01-01T00:00:00&to=2026-07-28T23:59:59.