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\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

Required field	Data type	Documentation
goid	string	default GoPay account used in createPayment if target is not specified
clientId	string	https://doc.gopay.com/en/?shell#oauth
clientSecret	string	https://doc.gopay.com/en/?shell#oauth
isProductionMode	boolean	test or production environment?

Optional fields

Optional field	Data type	Default value	Documentation
scope	string	GoPay\Definition\TokenScope::ALL	https://doc.gopay.com/en/?shell#scope
language	string	GoPay\Definition\Language::ENGLISH	language used in createPayment if lang is not specified + used for localization of errors
timeout	int	30	Browser timeout in seconds

### Available methods

API	SDK method
Create standard payment	$gopay->createPayment(array $payment)
Status of the payment	$gopay->getStatus($id)
Refund of the payment	$gopay->refundPayment($id, $amount)
Create recurring payment	$gopay->createPayment(array $payment)
Recurring payment on demand	$gopay->createRecurrence($id, array $payment)
Cancellation of the recurring payment	$gopay->voidRecurrence($id)
Create pre-authorized payment	$gopay->createPayment(array $payment)
Charge of pre-authorized payment	$gopay->captureAuthorization($id)
Cancellation of the pre-authorized payment	$gopay->voidAuthorization($id)

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}";
}

Method	Description
$response->hasSucceed()	checks if API returns status code 200
$response->json	decoded response, returned objects are converted into associative arrays
$response->statusCode	HTTP status code
$response->__toString()	raw body from HTTP 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

Type	Description
Language	Payment language, localization of error messages
Token scope	Authorization scope for OAuth2
Payment enums	Enums for creating payment
Response enums	Result of creating payment, executing payment operations
ItemType enums	Type of an item
VatRate enums	VatRate of an item

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()]
);

Available logger	Description
NullLogger	Default logger which does nothing
PrintHttpRequest	Prints basic information about request and response, used in remote tests

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.