WxPay

A simple Wechat pay ruby gem, without unnecessary magic or wrapper.

Please read official document first: https://mp.weixin.qq.com/paymch/readtemplate?t=mp/business/course3_tmpl&lang=zh_CN.

Installation

Add this line to your Gemfile:

gem 'wx_pay_api'
# or gem 'wx_pay_api', github: "https://github.com/lanrion/wx_pay_api"

And then execute:

$ bundle

Usage

Config

Create config/initializers/wx_pay.rb and put following configurations into it if you have only one weixin pay account.

# required
WxPay.appid = 'YOUR_APPID'
WxPay.key = 'YOUR_KEY'
WxPay.mch_id = 'YOUR_MCH_ID'

# optional - configurations for RestClient timeout, etc.
WxPay.extra_rest_client_options = {timeout: 2, open_timeout: 3}

Note: You should create your APIKEY (Link to 微信商户平台) first if you haven't, and pay attention that the length of the APIKEY should be 32.

APIs

Check official document for detailed request params and return fields

unifiedorder

WxPay supports both JSAPI, NATIVE and APP.

# required fields
params = {
  body: '测试商品',
  out_trade_no: 'test003',
  total_fee: 1,
  spbill_create_ip: '127.0.0.1',
  notify_url: 'http://making.dev/notify',
  trade_type: 'JSAPI', # could be "JSAPI", "NATIVE" or "APP",
  openid: 'OPENID' # required when trade_type is `JSAPI`
}

WxPay::Service.invoke_unifiedorder params will create an payment request and return a WxPay::Result instance(subclass of Hash) contains parsed result.

If your trade type is "JSAPI", the result would be like this.

r = WxPay::Service.invoke_unifiedorder params
# => {
#      "return_code"=>"SUCCESS",
#      "return_msg"=>"OK",
#      "appid"=>"YOUR APPID",
#      "mch_id"=>"YOUR MCH_ID",
#      "nonce_str"=>"8RN7YfTZ3OUgWX5e",
#      "sign"=>"623AE90C9679729DDD7407DC7A1151B2",
#      "result_code"=>"SUCCESS",
#      "prepay_id"=>"wx2014111104255143b7605afb0314593866",
#      "trade_type"=>"JSAPI"
#    }

If your trade type is "NATIVE", the result would be like this.

r = WxPay::Service.invoke_unifiedorder params
# => {
#      "return_code"=>"SUCCESS",
#      "return_msg"=>"OK",
#      "appid"=>"YOUR APPID",
#      "mch_id"=>"YOUR MCH_ID",
#      "nonce_str"=>"8RN7YfTZ3OUgWX5e",
#      "sign"=>"623AE90C9679729DDD7407DC7A1151B2",
#      "result_code"=>"SUCCESS",
#      "prepay_id"=>"wx2014111104255143b7605afb0314593866",
#      "code_url"=>"weixin://"
#      "trade_type"=>"NATIVE"
#    }

Return true if both return_code and result_code equal SUCCESS

r.success? # => true

pay request for app

# required fields
params = {
  prepayid: '1101000000140415649af9fc314aa427', # fetch by call invoke_unifiedorder with `trade_type` is `APP`
  noncestr: '1101000000140429eb40476f8896f4c9' # must same as given to invoke_unifiedorder
}

# call generate_app_pay_req
r = WxPay::Service::generate_app_pay_req params
# => {
#      appid: 'wxd930ea5d5a258f4f',
#      partnerid: '1900000109',
#      prepayid: '1101000000140415649af9fc314aa427',
#      package: 'Sign=WXPay',
#      noncestr: '1101000000140429eb40476f8896f4c9',
#      timestamp: '1398746574',
#      sign: '7FFECB600D7157C5AA49810D2D8F28BC2811827B'
#    }

Notify Process

A simple example of processing notify.

# config/routes.rb
post "notify" => "orders#notify"

# app/controllers/orders_controller.rb

def notify
  result = Hash.from_xml(request.body.read)["xml"]

  if WxPay::Sign.verify?(result)

    # find your order and process the post-paid logic.

    render :xml => {return_code: "SUCCESS"}.to_xml(root: 'xml', dasherize: false)
  else
    render :xml => {return_code: "SUCCESS", return_msg: "签名失败"}.to_xml(root: 'xml', dasherize: false)
  end
end

Integretion with QRCode(二维码)

Wechat payment integrating with QRCode is a recommended process flow which will bring users comfortable experience. It is recommended to generate QRCode using rqrcode and rqrcode_png.

Example Code (please make sure that public/uploads/qrcode was created):

r = WxPay::Service.invoke_unifiedorder params
qrcode_png = RQRCode::QRCode.new( r["code_url"], :size => 5, :level => :h ).to_img.resize(200, 200).save("public/uploads/qrcode/#{@order.id.to_s}_#{Time.now.to_i.to_s}.png")
@qrcode_url = "/uploads/qrcode/#{@order.id.to_s}_#{Time.now.to_i.to_s}.png"

Contributing

Bug report or pull request are welcome.

Make a pull request

Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request

Please write unit test with your code if necessary.

License

This project rocks and uses MIT-LICENSE.