weixin-payment

WeChat payment client library for PHP 5.5+

Features

• Simple, intuitive programming interface
• Composer-friendly; just install the package and go!
• PSR-7 compatible
• PSR-3 compatible
• Integrates with Laravel 5
• Fully tested

What it does (and doesn't)

The client exposes a simple programming interface to WeChat's payment-related web service calls. It transparently handles boilerplate stuff like request signing and XML serialization so you can focus on things that matter.

This package does not perform authentication; it will not help you get a user's OpenID. Fortunately, there are plenty of other packages that already do this. overtrue/wechat is a pretty good one.

Usage

Create a Client instance

$client = \ITC\Weixin\Payment\Client::instance([
    'app_id' => 'your appid',
    'secret' => 'your signing secret',
    'mch_id' => 'your merchant id',
    'public_key_path' => '/path/to/public_key',
    'private_key_path' => '/path/to/private_key',
]);

Start a payment

// execute the "pay/unifiedorder" command; the result is a Message instance
$result = $client->command('pay/unifiedorder')->execute([
    'openid' => 'wx_9f8a98g9a8geag0',
    'trade_type' => 'JSAPI',
    'out_trade_no' => 'your-order-id',
    'total_fee' => 1000,
]);

// authenticate the result
$authentic = $result->authenticate();

// if a prepay_id is in the Message, the payment is ready to execute
if ($authentic && $prepay_id = $result->get('prepay_id'))
{
    // jsapize() returns a JsonSerializable object
    $jsbridge_params = $client->jsapize(['prepay_id'=>$prepay_id]);
}

The $jsbridge_params object can then be JSON-serialized and supplied directly to the WeixinJSBridge global in the Javascript space. Here's an example:

var jsbridge_params = <?php echo json_encode($jsbridge_params) ?>;

WeixinJSBridge.invoke('getBrandWCPayRequest', jsbridge_params, function(result) {
    // do something with the result
});

Messages

This library represents XML payloads transported between the client and the WeChat web service as messages. A Message is an object that:

• can be serialized to XML
• supports hash-based signing and authentication
• provides key/value access to its attributes

How to create a Message instance

// create a Message instance with the "return_code" attribute
$message = $client->message(['return_code'=>'FAIL']);

How to add message attributes

$message->set('foo', 1);
$message->set('bar', 'two');

How to convert a message to XML

$message->serialize();

How to sign a message

// this adds a "sign" attribute to the Mesage instance
$message->sign();

$message->get('sign');
>>> "2C2B2A1D626E750FCFD0ED661E80E3AA"

How to authenticate a signed message

Generally, whenever you execute a Command (see below), you will want to authenticate the result:

$result = $client->command('pay/unifiedorder')->execute([/* ... */]);
$kosher = $result->authenticate();

Commands

The various web service calls to the payment API are commands. A Command is an object that has an execute method which returns a Message.

• pay/unifiedorder spec

  $result = $client->command('pay/unifiedorder')->execute([
      'openid' => 'wx_9f8a98g9a8geag0',
      'trade_type' => 'JSAPI',
      'out_trade_no' => 'domain-order-id',
      'total_fee' => 1000,
  ]);

• pay/orderquery spec

  // query a payment by wechat transaction id
  $result = $client->command('pay/orderquery')->execute([
      'transaction_id' => '1008450740201411110005820873'
  ]);
  
  // or by domain order id ("out_trade_no")
  $result = $client->command('pay/orderquery')->execute([
      'out_trade_no' => 'domain-order-id'
  ]);

• pay/closeorder spec (NOT IMPLEMENTED)

  $result = $client->command('pay/closeorder')->execute([/* ... */]);

• secapi/refund spec (NOT IMPLEMENTED)

  $result = $client->command('secapi/refund')->execute([/* ... */]);

• pay/refundquery spec (NOT IMPLEMENTED)

  $result = $client->command('pay/refundquery')->execute([/* ... */]);

• pay/downloadbill spec (NOT IMPLEMENTED)

  $result = $client->command('pay/downloadbill')->execute([/* ... */]);

• payitil/report spec (NOT IMPLEMENTED)

  $result = $client->command('payitil/report')->execute([/* ... */]);

• tools/shorturl spec (NOT IMPLEMENTED)

  $result = $client->command('tools/shorturl')->execute([/* ... */]);

• mmpaymkttransfers/sendredpack spec

  $result = $client->command('mmpaymkttransfers/sendredpack')->execute([
      'mch_billno' => '10000098201411111234567890',
      'send_name' => '天虹百货',
      're_openid' => 'oxTWIuGaIt6gTKsQRLau2M0yL16E',
      'total_amount' => 1000,
      'total_num' => 1,
      'client_ip' => '192.168.0.1',
      'wishing' => '感谢您参加猜灯谜活动，祝您元宵节快乐！',
      'act_name' => '猜灯谜抢红包活动',
      'remark' => '猜越多得越多，快来抢！',
  ]);

• mmpaymkttransfers/gethbinfo spec

  $result = $client->command('mmpaymkttransfers/gethbinfo')->execute([
      'mch_billno' => '10000098201411111234567890',
      'bill_type' => 'MCHT',
  ]);

Installation

Composer

composer require itc/weixin-payment:1.3.0

Laravel

The package ships with a Laravel 5 service provider that registers the Client on the application service container. Install the service provider by adding the following line to the providers array in config/app.php:

ITC\Weixin\Payment\ServiceProvider::class

Then publish the package configuration via:

php artisan vendor:publish

Now you can access the client instance via dependency injection or through the service container:

$client = App::make('ITC\Weixin\Payment\Contracts\Client');

Contributing

Feel free to fork this project and create a pull request!

How to implement a Command

1. Implement a concrete ITC\Weixin\Payment\Contracts\Command. Feel free to extend ITC\Weixin\Payment\Command\Command.

2. Register the command inside Client::instance():

   public static function instance()
   {
       ...
       
       $client->register(Command\YourCommand::class);
       ...
   }
   

How to run tests

./phpunit

License

MIT