健易保base64加密

入参说明：

示例接口：https://xhs.yibaojiankang.com/api/hmb/order/audit

测试线上统一用：token = 'rqpllwgnuicj4rukbbo8c6mqsyzh2ajs'

待处理数据
params = {
    "policyNo":"90000001",
    "applicantName": "张三是",
    "applicantMobile": "16619872340",
    "applyDate": "2020-10-13 17:43:21",
    "customerName": "网上我的",
    "customerIdCard": "411456789",
    "customerSex": "f",
    "buyWay": "1",
    "requestId": "45000000002",
    "beginTime": "2020-10-13 17:43:21",
    "endTime": "2020-10-13 17:43:21",
    "imageList": [{
        "url": "http://taikang-huiminbao.oss-cn-hangzhou.aliyuncs.com/baoxian/taikang/1308/202010161576494003610.jpg?Expires=4756437979&OSSAccessKeyId=LTAI4G6rKc8xdZPkn3kKCkKJ&Signature=3A6JuK6TvwgHgL5P%2BxQH7o%2Bn2%2B8%3D",
        "imageType": "05"
    }]
}

params使用base64加密后字符串：
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

sign 生成说明,字符串拼接，"base64的值拼接上token" 然后以md5摘要形式生成。
拼接完成的字符串           
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

生成sign值：99d9ef96b2e75642cef31bf2c43f0dd6

组合入参参数
{"params": "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", "sign": "99d9ef96b2e75642cef31bf2c43f0dd6"}