LiqPay Payment Module

LiqPay PHP SDK for seamless integration with LiqPay payment gateway.

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Documentation

For full API reference and details, see the LiqPay API documentation:
LiqPay API Docs

Table of Contents

1. Installation
2. Quick Start
3. Usage
4. Public Methods
   • Methods Summary
   • api
   • get_response_code
   • cnb_form
   • cnb_form_raw
   • cnb_signature
   • decode_params
   • str_to_sign

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Installation

Install via Composer:

composer require liqpay/liqpay

Or include manually:

require_once 'path/to/LiqPay.php';

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Quick Start

use LiqPay;

$liqpay = new LiqPay('your_public_key', 'your_private_key');

// Check payment status
$response = $liqpay->api('payment/status', [
    'version'  => 3,
    'action'   => 'status',
    'order_id' => 'order123',
]);

// Generate checkout form
echo $liqpay->cnb_form([
    'version'     => 3,
    'action'      => 'pay',
    'amount'      => 100.50,
    'currency'    => 'USD',
    'description' => 'Order #123 Payment',
    'language'    => 'en',
]);

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Usage

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Public Methods

Methods Summary

Method	Signature	Description
api	api(string $path, array $params = [], int $timeout = 5): object|array	Call LiqPay API and return parsed response.
get_response_code	get_response_code(): int|null	Last HTTP status code from API.
cnb_form	cnb_form(array $params): string	Render HTML checkout form.
cnb_form_raw	cnb_form_raw(array $params): array	Raw URL, data, and signature.
cnb_signature	cnb_signature(array $params): string	Compute data signature for checkout.
decode_params	decode_params(string $data): array	Decode Base64‑encoded payload.
str_to_sign	str_to_sign(string $str): string	Generate Base64‑SHA1 signature.

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__construct

Initialize the LiqPay client with your credentials.

public function __construct(
    string $public_key,
    string $private_key,
    string|null $api_url = null
)

• Parameters:
  • $public_key (string) — Your LiqPay public key.
  • $private_key (string) — Your LiqPay private key.
  • $api_url (string|null) — Override default API endpoint.
• Exceptions:
  • InvalidArgumentException if keys are empty.

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api

Send a request to a LiqPay API endpoint and get a parsed response.

public function api(
    string $path,
    array $params = [],
    int $timeout = 5
): object\|array

• Parameters:
  • $path (string) — Endpoint path (e.g., 'payment/status').
  • $params (array) — Must include version and action (e.g., 'pay').
  • $timeout (int) — Timeout in seconds (connect + exec).
• Returns:
  • JSON-decoded object on success.
  • ['error' => '...'] on failure.
• Exceptions:
  • InvalidArgumentException if required params missing.

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get_response_code

Retrieve HTTP status code from the last api() call.

public function get_response_code(): int\|null

• Returns:
  • HTTP status code (e.g., 200) or null.

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cnb_form

Render a fully functional HTML checkout form with LiqPay JavaScript SDK.

public function cnb_form(array $params): string

• Parameters:
  • version, action, amount, currency, description (required)
  • language (optional) — 'uk', 'ru', or 'en'.
• Returns:
  • HTML <form> string with embedded button.
• Example:

echo $liqpay->cnb_form([
  'version'     => 3,
  'action'      => 'paydonate',
  'amount'      => 5,
  'currency'    => 'UAH',
  'description' => 'Support project',
  'language'    => 'uk',
]);

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cnb_form_raw

Get raw payload data for custom form implementations.

public function cnb_form_raw(array $params): array

• Returns:

  [
    'url'       => 'https://www.liqpay.ua/api/3/checkout',
    'data'      => '<Base64 JSON>',
    'signature' => '<Signature>',
  ]

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cnb_signature

Compute the signature for given parameters (used in custom integrations).

public function cnb_signature(array $params): string

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decode_params

Decode Base64‑encoded payment data back to an array.

public function decode_params(string $data): array

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str_to_sign

Generate a Base64‑SHA1 signature for any string.

public function str_to_sign(string $str): string

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