/// <summary>
/// 商户系统先调用该接口在微信支付服务后台生成预支付交易单，返回正确的预支付交易回话标识后再在App里面调起支付。
/// </summary>
/// <param name="orderId">商户系统内部的订单号，32个字符内、可包含字母，其他说明见商户订单号。</param>
/// <param name="orderName">商品描述交易字段格式根据不同的应用场景按照以下格式：App——需传入应用市场上的App名字-实际商品名称，天天爱消除-游戏充值。</param>
/// <param name="orderPrice">订单总金额，单位为分。</param>
/// <param name="clientIp">用户端实际IP。</param>
/// <returns>微信生成的预支付回话标识，用于后续接口调用中使用，该值有效期为2小时。</returns>
public async Task <string> UnifiedOrderAsync(string orderId, string orderName, int orderPrice, string clientIp)
{
var request = new UnifiedOrderRequest
{
Body = orderName,
OutTradeNo = orderId,
TotalFee = orderPrice,
SpbillCreateIp = clientIp
};
var response = await UnifiedOrderAsync(request).ConfigureAwait(false);
return(response.PrepayId);
}
/// <summary>
/// 商户系统先调用该接口在微信支付服务后台生成预支付交易单，返回正确的预支付交易回话标识后再在App里面调起支付。
/// </summary>
/// <param name="orderId">商户系统内部的订单号，32个字符内、可包含字母，其他说明见商户订单号。</param>
/// <param name="orderName">商品描述交易字段格式根据不同的应用场景按照以下格式：App——需传入应用市场上的App名字-实际商品名称，天天爱消除-游戏充值。</param>
/// <param name="productId">32个字符以内的商品编号。</param>
/// <param name="productName">商品名称。</param>
/// <param name="productPrice">商品单价，单位为分。</param>
/// <param name="productQuantity">商品数量。</param>
/// <param name="clientIp">用户端实际IP。</param>
/// <returns>微信生成的预支付回话标识，用于后续接口调用中使用，该值有效期为2小时。</returns>
public async Task <string> UnifiedOrderAsync(string orderId, string orderName, string productId, string productName, int productPrice, int productQuantity, string clientIp)
{
var request = new UnifiedOrderRequest
{
Body = orderName,
Detail = new List <GoodsDetail>
{
new GoodsDetail
{
GoodsId = productId,
GoodsName = productName,
Quantity = productQuantity,
Price = productPrice
}
},
OutTradeNo = orderId,
TotalFee = productPrice * productQuantity,
SpbillCreateIp = clientIp
};
var response = await UnifiedOrderAsync(request).ConfigureAwait(false);
return(response.PrepayId);
}
public Task <UnifiedOrderResponse> UnifiedOrderAsync(UnifiedOrderRequest request)
{
return(RequestAsync <UnifiedOrderResponse>("https://api.mch.weixin.qq.com/pay/unifiedorder", RequestProperties, UnifiedOrderRequestProperties, request));
}