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NET C#实现微信小微商户进件API，微信小微商户申请

申请状态查询返回数据

微信支付SDK

图片上传

using Helper.Http;
using Model;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using WxPayAPI;
 
namespace WechatXiaowei.upmedia
{
    class upimage
    {
        /// <summary>
        /// 上传本地图片到微信服务器
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static result localfile(string filePath)
        {
            FileStream file = new FileStream(filePath, FileMode.Open);
            byte[] bb = new byte[file.Length];
            file.Read(bb, 0, (int)file.Length);
            file.Close();
            string fileName = Path.GetFileName(filePath);
            MsMultiPartFormData form = new MsMultiPartFormData();
            string decodeName = HttpUtility.UrlDecode(Path.GetFileName(fileName));//最终服务器会按原文件名保存文件，所以需要将文件名编码下，防止中文乱码
            string fileKeyName = "media";
            form.AddStreamFile(fileKeyName, fileName, bb);
 
             
            string hashMd5 =HashHelper.ComputeMD5(filePath);
 
            WxPayData inputObj = new WxPayData();
            inputObj.SetValue("mch_id", Config.GetMchID);
            inputObj.SetValue("media_hash", hashMd5);
            inputObj.SetValue("sign_type", "HMAC-SHA256");
            //inputObj.SetValue("sign", inputObj.MakeSign());//签名
 
            form.AddFormField("mch_id", Config.GetMchID);
            form.AddFormField("media_hash", hashMd5);
            form.AddFormField("sign_type", "HMAC-SHA256");
            form.AddFormField("sign", inputObj.MakeSign());//签名
 
            //最终接收文件上传的服务接口
            string SERVICE_URL = "https://api.mch.weixin.qq.com/secapi/mch/uploadmedia";
 
            string rst = Http.PostWithMsMultiPartFormData(inputObj.ToXml(), SERVICE_URL, form, true, 10);
 
            inputObj = new WxPayData();
            inputObj.FromXml(rst);
 
            //返回实体结果
            result result = null;
            if (inputObj.GetValue("return_code").ToString() == "SUCCESS")
            {
                result = new Model.upimage.result()
                {
                    code = Result.SUCCESS,
                    media_id = inputObj.GetValue("media_id").ToString()
                };
            }
            else
            {
                result = new Model.upimage.result()
                {
                    code = Result.FAIL,
                    message = inputObj.GetValue("return_msg").ToString()
                };
            }
            return result;
        }
 
    }
}

关键：multipart/form-data 格式上传图片 + 签名
参考：https://blog.csdn.net/pjj802366/article/details/51645150

证书下载
证书下载接口API文档

关键1：Authorization加密信息生成
关键2：证书解密《通过以下PHP解决》

敏感信息加密（+证书解密）
敏感信息加密API说明

参考：https://blog.csdn.net/u010324331/article/details/81938979
注意：这个功能是通过PHP方式解决加密的问题
使用>Php7.2，开启下libsodium扩展。方法为：在php.ini 增加： extension=php_sodium.dll

$ciphertext = base64_decode($_POST['ciphertext']);

$ciphertext = base64_decode($_POST['ciphertext']);
$associated_data= $_POST['associated_data'];
$nonce  = $_POST['nonce'];
$aes_key= '自己设定key';
 
 
// sodium_crypto_aead_aes256gcm_decrypt >=7.2版本，去php.ini里面开启下libsodium扩展就可以，之前版本需要安装libsodium扩展，
//具体查看php.net（ps.使用这个函数对扩展的版本也有要求哦，扩展版本 >=1.08）
//$b= sodium_crypto_aead_aes256gcm_is_available();
 
$plaintext  = sodium_crypto_aead_aes256gcm_decrypt($ciphertext, $associated_data, $nonce, $aes_key);
//print_r( $plaintext,false );
 
//敏感信息加密
$string = $_POST['string'];
$publicKeyResource = openssl_get_publickey($plaintext);
$f= openssl_public_encrypt($string, $crypted, $publicKeyResource, OPENSSL_PKCS1_PADDING);
openssl_free_key($publicKeyResource);
if ($f) {
    print_r( base64_encode($crypted));
}
?>