GoPay's PHP SDK for Payments REST API

## Requirements

• PHP >= 5.4.0
• enabled extension curl, json

## Installation

The simplest way to install SDK is to use Composer:

composer require gopay/payments-sdk-php

Basic usage

// minimal configuration
$gopay = GoPay\Api::payments([
    'goid' => 'my goid',
    'clientId' => 'my id',
    'clientSecret' => 'my secret',
    'isProductionMode' => false
]);

// full configuration
$gopay = GoPay\Api::payments([
    'goid' => 'my goid',
    'clientId' => 'my id',
    'clientSecret' => 'my secret',
    'isProductionMode' => false,
    'scope' => GoPay\Definition\TokenScope::ALL,
    'language' => GoPay\Definition\Language::CZECH,
    'timeout' => 30
]);

Configuration

Required fields

Optional fields

### Available methods

SDK response? Has my call succeed?

SDK returns wrapped API response. Every method returns GoPay\Http\Response object. Structure of json/__toString should be same as in documentation. SDK throws no exception. Please create an issue if you catch one.

$response = $gopay->createPayment([/* define your payment  */]);
if ($response->hasSucceed()) {
    echo "hooray, API returned {$response}";
    return $response->json['gw_url']; // url for initiation of gateway
} else {
    // errors format: https://doc.gopay.com/en/?shell#http-result-codes
    echo "oops, API returned {$response->statusCode}: {$response}";
}

### Are required fields and allowed values validated?

No. API validates fields pretty extensively so there is no need to duplicate validation in SDK. It would only introduce new type of error. Or we would have to perfectly simulate API error messages. That's why SDK just calls API which behavior is well documented in doc.gopay.com.

Advanced usage

Initiation of the payment gateway

// create payment and pass url to template 
$response = $gopay->createPayment([/* define your payment  */]);
if ($response->hasSucceed()) {
    $templateParameters = [
        'gatewayUrl' => $response->json['gw_url'],
        'embedJs' => $gopay->urlToEmbedJs()
    ];
    // render template
}

Inline gateway

<form action="<?php echo $gatewayUrl; ?>" method="post" id="gopay-payment-button">
  <button name="pay" type="submit">Pay</button>
  <script type="text/javascript" src="<?php echo $embedJs;>"></script>
</form>

Redirect gateway

<form action="<?php echo $gatewayUrl; ?>" method="post">
  <button name="pay" type="submit">Pay</button>
</form>

Asynchronous initialization using JavaScript

Enums (Code lists)

Instead of hardcoding bank codes string you can use predefined enums. Check using enums in create-payment example

Framework integration

• Symfony2

Cache access token

Access token expires after 30 minutes so it's expensive to use new token for every request. Unfortunately it's default behavior of GoPay\Token\InMemoryTokenCache. But you can implement your cache and store tokens in Memcache, Redis, files, ... It's up to you.

Your cache must implement GoPay\Token\TokenCache interface. Be aware that there are two scopes (TokenScope) and SDK can be used for different clients (clientId, isProductionMode). So client passed to methods is unique identifier (string) that is built for current environment. Below you can see example implementation of caching tokens in file:

// register cache in optional service configuration
$gopay = GoPay\payments(
    [/* your config */],
    ['cache' => new PrimitiveFileCache()]
);

<?php

use GoPay\Token\TokenCache;
use GoPay\Token\AccessToken;

class PrimitiveFileCache implements TokenCache
{
    public function setAccessToken($client, AccessToken $t)
    {
        file_put_contents(__DIR__ . "/{$client}", serialize($t));
    }

    public function getAccessToken($client)
    {
        $file = __DIR__ . "/{$client}";
        if (file_exists($file)) {
            return unserialize(file_get_contents($file));
        }
        return null; 
    }
}

Log HTTP communication

You can log every request and response from communication with API. Check available loggers below. Or you can implement your own logger, just implement GoPay\Http\Log\Logger interface.

// register logger in optional service configuration
$gopay = GoPay\payments(
    [/* your config */],
    ['logger' => new GoPay\Http\Log\PrintHttpRequest()]
);

Contributing

Contributions from others would be very much appreciated! Send pull request/ issue. Thanks!

License

Copyright (c) 2015 GoPay.com. MIT Licensed, see LICENSE for details.