随着微软的开源，越来越多的项目支持跨平台，但是各种支付平台提供的类库，又老又不支持跨平台，吐槽下，尤其是微信，还有好多坑，于是ICanPay诞生了，今天就来讲ICanPay是什么，怎么使用？
ICanPay是一个支持多商户多种支付方式的跨平台网关处理类库，使用ICanPay可以简化订单的创建、查询、退款和接收网关返回的支付通知等操作。
目前支持的支付网关有：支付宝(Alipay)、微信支付(Wechatpay)、银联支付(Unionpay)
下面以支付宝为例，其余两种支付，请参考Wiki
1. 配置商户数据
1.在Startup中添加商户数据
services.AddICanPay(a =>
{
var gateways = new Gateways();
var merchant = new Merchant
{
AppId = "",
NotifyUrl = "",
ReturnUrl = "",
AlipayPublicKey = "",
Privatekey = ""
};
gateways.Add(new AlipayGateway(merchant));
return gateways;
});
2.在Startup中使用ICanPay
app.UseICanPay();
以上就简单的完成了对ICanPay的配置操作
2.支付
ICanPay支持多种支付方式，下面就来讲解如何使用
1.获取支付网关
private readonly IGateways gateways;
public YourController(IGateways gateways)
{
this.gateways = gateways;
}
2.创建订单
var order = new Order()
{
Amount = 0.01,
OutTradeNo = "订单号",
Subject = "测试",
};
3.设置支付方式
var gateway = gateways.Get<AlipayGateway>(GatewayTradeType.Web);
4.支付
gateway.Payment(order);
特殊说明：GatewayTradeType.Barcode支付方式，需要再实现PaymentSucceed和PaymentFailed事件
3.异步通知
1.获取支付网关
private readonly IGateways gateways;
public NotifyController(IGateways gateways)
{
this.gateways = gateways;
}
2.实现支付通知事件
PaymentNotify notify = new PaymentNotify(gateways);
notify.PaymentSucceed += Notify_PaymentSucceed;
notify.PaymentFailed += Notify_PaymentFailed;
notify.UnknownGateway += Notify_UnknownGateway;
private void Notify_PaymentSucceed(object sender, PaymentSucceedEventArgs e)
{
// 支付成功时时的处理代码
/* 建议添加以下校验。
* 1、需要验证该通知数据中的OutTradeNo是否为商户系统中创建的订单号，
* 2、判断Amount是否确实为该订单的实际金额（即商户订单创建时的金额），
*/
if (e.GatewayType == typeof(AlipayGateway))
{
var notify = (Notify)e.Notify;
}
}
private void Notify_PaymentFailed(object sender, PaymentFailedEventArgs e)
{
// 支付失败时的处理代码
}
private void Notify_UnknownGateway(object sender, UnknownGatewayEventArgs e)
{
// 无法识别支付网关时的处理代码
}
3.接收支付通知
await notify.ReceivedAsync();
4.辅助接口
1.查询
var notify = (Notify)gateway.Query(new Auxiliary
{
OutTradeNo = "订单号"
});
2.撤销
var notify = (Notify)gateway.Cancel(new Auxiliary
{
OutTradeNo = "订单号"
});
3.关闭
var notify = (Notify)gateway.Close(new Auxiliary
{
OutTradeNo = "订单号"
});
4.退款
var notify = (Notify)gateway.Refund(new Auxiliary
{
OutTradeNo = "订单号"，
RefundAmount = 123,
OutRefundNo = "退款单号"
});
5.退款查询
var notify = (Notify)gateway.RefundQuery(new Auxiliary
{
OutTradeNo = "订单号"，
OutRefundNo = "退款单号"
});
6.对账单下载
gateway.BillDownload(new Auxiliary
{
BillType = "trade",
BillDate = "2017-10-31"
});
以上就简单的讲解了如何使用ICanPay,如果有什么问题，也可以在Github上提问。
项目地址：ICanPay