在 Rails 中接入微信支付指北

准备工作

在接入微信支付前，需要准备以下内容：

• 微信支付商户号
• API密钥
• 证书文件

安装相关Gem

# Gemfile
gem 'wx_pay'
      

配置微信支付

# config/initializers/wx_pay.rb
WxPay.appid = 'YOUR_APPID'
WxPay.key = 'YOUR_KEY'
WxPay.mch_id = 'YOUR_MCH_ID'
WxPay.apiclient_cert_path = 'path/to/apiclient_cert.p12'
WxPay.apiclient_cert_password = 'cert_password'
      

创建支付订单

def create_payment
  params = {
    body: '商品描述',
    out_trade_no: "order_#{Time.now.to_i}",
    total_fee: (product.price * 100).to_i, # 金额以分为单位
    spbill_create_ip: request.remote_ip,
    notify_url: 'https://example.com/wx_notify',
    trade_type: 'JSAPI',
    openid: current_user.wx_openid
  }
  
  result = WxPay::Service.invoke_unifiedorder(params)
  
  if result.success?
    # 生成支付参数
    payment_params = {
      appId: WxPay.appid,
      timeStamp: Time.now.to_i.to_s,
      nonceStr: SecureRandom.hex(16),
      package: "prepay_id=#{result['prepay_id']}",
      signType: 'MD5'
    }
    
    payment_params[:paySign] = WxPay::Sign.generate(payment_params)
    
    render json: { payment_params: payment_params }
  else
    render json: { error: result['return_msg'] }, status: :unprocessable_entity
  end
end
      

处理支付通知

def wx_notify
  result = Hash.from_xml(request.body.read)['xml']
  
  if WxPay::Sign.verify?(result)
    # 处理支付成功逻辑
    order = Order.find_by(out_trade_no: result['out_trade_no'])
    order.update(status: 'paid') if order
    
    render xml: { return_code: 'SUCCESS', return_msg: 'OK' }.to_xml(root: 'xml', dasherize: false)
  else
    render xml: { return_code: 'FAIL', return_msg: '签名失败' }.to_xml(root: 'xml', dasherize: false)
  end
end