公众号交易微信电子发票怎么接入?微信电子发票接入流程，随着微信电子发票的推出，越来越多的公司开始使用起了微信电子发票，但我们要知道微信电子发票使用起来并不简单，首先在使用之前，我们得接入微信电子发票。下面小编就给大家讲下微信电子发票怎么接入?微信电子发票接入流程。
一、微信电子发票接流程图
电子发票流程涉及用户、商户、报销方、发票平台和公众平台五个角色。
对于自建发票平台的商户，发票平台即为商户自身的开票系统，承担着制作发票卡券、将发
票卡券插入用户卡包以及报销状态更新的关键作用。
二、微信电子发票接入步骤及页面
步骤1：检查是否微信打开
步骤2：检查微信版本是否高于或者等于6.0.2版本
//"Mozilla/5.0(iphone;CPU iphone OS 5_1_1 like Mac OS X)
//AppleWebKit / 534.46(KHTML, like Geocko)Mobile / 9B206 MicroMessenger/ 6.0.2 "
//其中6.0.2为用户安装的微信版本号。商户可以判定版本号是否高于或者等于6.0.2。
步骤3：检查发票是否真实存在
步骤4：获取微信token
/// <summary>
///获取微信token
/// </summary>
/// <returns></returns>
public static string GetToken()
{
string CGIBaseUrl = GlobalConfig.Settings["WechartBaseUrl"];
string AppId = GlobalConfig.Settings["EfpgjAppId"];
string security = GlobalConfig.Settings["EfpgjSecurity"];
ObjectCache oCache = MemoryCache.Default;
string fileContents = oCache["wechart_token"] as string;
if (fileContents == null)
{
var url = string.Format("{0}/token?grant_type=client_credential&appid={1}&secret={2}",
CGIBaseUrl + "/cgi-bin", AppId, security);
using (WebClient client = new WebClient())
{
client.Encoding = Encoding.UTF8;
string data = client.DownloadString(url);
var result = JObject.Parse(data);
if (result["access_token"] != null && result["access_token"].Value<string>() != string.Empty)
{
CacheItemPolicy policy = new CacheItemPolicy();
policy.AbsoluteExpiration = DateTime.Now.AddMinutes(120);//取得或设定值，这个值会指定是否应该在指定期间过后清除
fileContents = result["access_token"].Value<string>();
oCache.Set("wechart_token", fileContents, policy);
}
}
}
return fileContents;
}
步骤5：获取发票平台 s_pappid
步骤6：获取发票 ticket
/// <summary>
/// 获取临时Ticket
/// </summary>
/// <param name="token"></param>
/// <returns></returns>
public static string GetTicket(string token)
{
ObjectCache oCache = MemoryCache.Default;
string fileContents = oCache["wechart_ticket"] as string;
if (fileContents == null)
{
string CGIBaseUrl = GlobalConfig.Settings["WechartBaseUrl"];
var url = string.Format("{0}/cgi-bin/ticket/getticket?access_token={1}&type=wx_card",
CGIBaseUrl, token);
var data = string.Empty;
var arg = new
{
access_token = token
};
var paramStr = JsonConvert.SerializeObject(arg);
using (var client = new WebClient())
{
client.Encoding = Encoding.UTF8;
data = client.UploadString(url, paramStr);
}
var result = JObject.Parse(data);
CacheItemPolicy policy = new CacheItemPolicy();
policy.AbsoluteExpiration = DateTime.Now.AddMinutes(120);//取得或设定值，这个值会指定是否应该在指定期间过后清除
fileContents = result["ticket"].Value<string>();
oCache.Set("wechart_ticket", fileContents, policy);
}
return fileContents;
}
步骤7：获取授权页链接URL
/// <summary>
/// 获取授权页链接
/// </summary>
/// <param name="CGIBaseUrl"></param>
/// <param name="token"></param>
/// <returns></returns>
public static string GetAuthUrl(string token, EInvoice invoice, int flags)
{
var spid = CheckToken(token);
try
{
string CGIBaseUrl = GlobalConfig.Settings["WechartBaseUrl"];
var url = string.Format("{0}/card/invoice/getauthurl?access_token={1}",
CGIBaseUrl, token);
var data = string.Empty;
var arg = new
{
s_pappid = spid,
order_id = invoice.SwiftNumber,
money = invoice.SummaryAmount * 100,
timestamp = ConvertDateTimeInt(DateTime.Now),
source = "web",
redirect_url = GlobalConfig.Settings["WechartEIUrl"] + "/#!/wechartCardReturn/" + invoice.Id+"/"+invoice.CustomerName + "/" + flags,
//redirect_url = "http://eiapp.chinacloudsites.cn" + "/#!/testInsertcardCpt/" + SwiftNumber,
ticket = GetTicket(token),
type = 2,//授权类型， 0：开票授权， 1：填写字段开票授权， 2：领票授权
};
var paramStr = JsonConvert.SerializeObject(arg);
using (var client = new WebClient())
{
client.Encoding = Encoding.UTF8;
data = client.UploadString(url, paramStr);
}
var result = JObject.Parse(data);
if (result["auth_url"] != null && result["auth_url"].Value<string>() != string.Empty)
{
return result["auth_url"].Value<string>();
}
else
return data;
}
catch (Exception ex)
{
return spid + "/" + token + "/" + ex.Message;
}
}
步骤8：步骤7接口字段：授权成功后跳转页面，此页面中进行创建卡券-将电子发票插入用户卡包中操作
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