https://developers.weixin.qq.com/miniprogram/dev/OpenApiDoc/mp-message-management/subscribe-message/sendMessage.html

调用接口：
https://api.weixin.qq.com/cgi-bin/message/subscribe/send?access_token=ACCESS_TOKEN
上面的 ACCESS_TOKEN 已经让我换成实际中的 token 字段串了没问题

//模板 data
$tmpData    = [
    'thing1'   => ['value'=>$buyUserInfo->user_name],
    'thing2'   => ['value'=>$productInfo->product_name],
    'amount3'  => ['value'=>$shopOrderModel->order_total_real_price],
    'character_string4' => ['value'=>$shopOrderModel->order_sn],
    'thing6'   => ['value'=>$shopOrderModel->order_note]
];

$postData   = [
    'touser'         => $shopUserConfigModel->wx_open_id,
    'template_id'     => 'AIaIS2CYJKSVSIEhLXa4w7TCzzhgf7utttE0d_2UUic',
    'page'          => 'index',
    "miniprogram_state"    =>"developer",
    'lang'          => 'zh_CN',
    'data'          => $tmpData,
];

参数都是按文档上要求写的

//同步请示
$client    = new Client();
$res       = $client->post($postUrl,['form_params'=>$postData]);

接口返回：

"errcode": 47001,

"errmsg": "data format error rid: 663c7ee6-027f88e7-0d0b7d1b"