# WechatPay

WechatPay API wrapper in Elixir.

[![Travis](https://img.shields.io/travis/linjunpop/wechat_pay.svg)](https://travis-ci.org/linjunpop/wechat_pay)
[![Hex.pm](https://img.shields.io/hexpm/v/wechat_pay.svg)](https://hex.pm/packages/wechat_pay)
[![Inline docs](http://inch-ci.org/github/linjunpop/wechat_pay.svg)](http://inch-ci.org/github/linjunpop/wechat_pay)

## Installation

If [available in Hex](https://hex.pm/docs/publish), the package can be installed as:

  1. Add `wechat_pay` to your list of dependencies in `mix.exs`:

    ```elixir
    def deps do
      [{:wechat_pay, "~> 0.1.0"}]
    end
    ```

  2. Ensure `wechat_pay` is started before your application:

    ```elixir
    def application do
      [applications: [:wechat_pay]]
    end
    ```

## Usage

### Config `:wechat_pay`

```elixir
use Mix.Config

config :wechat_pay,
  env: :sandbox,
  appid: "wx8888888888888888",
  mch_id: "1900000109",
  apikey: "192006250b4c09247ec02edce69f6a2d",
  ssl_cacertfile: "certs/ca.cert",
  ssl_certfile: "certs/client.crt",
  ssl_keyfile: "certs/client.key",
  ssl_password: "test"
```

Or in production

```elixir
use Mix.Config

config :wechat_pay,
  env: :production,
  appid: {:system, "WECHAT_PAY_APP_ID"},
  mch_id: {:system, "WECHAT_PAY_MCH_ID"},
  apikey: {:system, "WECHAT_PAY_API_KEY"},
  ssl_cacertfile: {:system, "WECHAT_PAY_SSL_CA_CERTFILE"},
  ssl_certfile: {:system, "WECHAT_PAY_SSL_CERTFILE"},
  ssl_keyfile: {:system, "WECHAT_PAY_SSL_KEYFILE"},
  ssl_password: {:system, "WECHAT_PAY_SSL_PASSWORD"}
```

### APIs

[https://pay.weixin.qq.com/wiki/doc/api/index.html](https://pay.weixin.qq.com/wiki/doc/api/index.html)

#### JSAPI（公众号支付）

- [x] `WechatPay.API.place_order(params)`
- [x] `WechatPay.API.query_order(params)`
- [x] `WechatPay.API.close_order(params)`
- [x] `WechatPay.API.refund(params)`
- [x] `WechatPay.API.query_refund(params)`
- [x] `WechatPay.API.download_bill(params)`
- [x] `WechatPay.API.report(params)`
- [x] `WechatPay.HTML.generate_pay_request(prepay_id)`

#### Native（扫码支付）

- [x] `WechatPay.API.place_order(params)`
- [x] `WechatPay.API.query_order(params)`
- [x] `WechatPay.API.close_order(params)`
- [x] `WechatPay.API.refund(params)`
- [x] `WechatPay.API.query_refund(params)`
- [x] `WechatPay.API.download_bill(params)`
- [x] `WechatPay.API.report(params)`
- [x] `WechatPay.API.shorten_url(url)`

#### APP（APP支付）

- [x] `WechatPay.API.place_order(params)`
- [x] `WechatPay.API.query_order(params)`
- [x] `WechatPay.API.close_order(params)`
- [x] `WechatPay.API.refund(params)`
- [x] `WechatPay.API.query_refund(params)`
- [x] `WechatPay.API.report(params)`
- [x] `WechatPay.API.download_bill(params)`

#### Example

```elixir
params = %{
  device_info: "WEB",
  body: "时习-#{event.title}",
  attach: nil,
  out_trade_no: order.order_number,
  fee_type: "CNY",
  total_fee: order.fee,
  spbill_create_ip: Keyword.get(opts, :remote_ip),
  notify_url: @notify_url,
  time_start: now |> format_datetime,
  time_expire: now |> Timex.shift(hours: 1) |> format_datetime,
  trade_type: "JSAPI",
  openid: User.openid(user),
}

case WechatPay.place_order(params) do
  {:ok, order} ->
    order
  {:error, reason} ->
    IO.inspect reason
end
```

### Handle callback

```elixir
defmodule MyApp.WechatPayController do
  use MyApp.Web, :controller

  plug WechatPay.Plug.Notify

  def callback(conn, _parasm) do
    data = conn.private[:wechat_pay_result]

    case data.result_code do
      "SUCCESS" ->
        IO.inspect data
        # %{
        #   appid: "wx2421b1c4370ec43b",
        #   attach: "支付测试",
        #   bank_type: "CFT",
        #   fee_type: "CNY",
        #   is_subscribe: "Y",
        #   mch_id: "10000100",
        #   nonce_str: "5d2b6c2a8db53831f7eda20af46e531c",
        #   openid: "oUpF8uMEb4qRXf22hE3X68TekukE",
        #   out_trade_no: "1409811653",
        #   result_code: "SUCCESS",
        #   return_code: "SUCCESS",
        #   sign: "594B6D97F089D24B55156CE09A5FF412",
        #   sub_mch_id: "10000100",
        #   time_end: "20140903131540",
        #   total_fee: "1",
        #   trade_type: "JSAPI",
        #   transaction_id: "1004400740201409030005092168"
        # }

        conn
        |> WechatPay.Plug.Notify.response_with_success_info
      _ ->
        conn
        |> send_resp(:unprocessable_entity, "")
    end
  end
end
```