curl --location -g --request GET 'http://127.0.0.1/cgi-bin/externalcontact/get_subscribe_qr_code?access_token={{accesstoken}}'
{
"errcode": 0,
"qrcode_big": "string",
"qrcode_middle": "string",
"errmsg": "string",
"qrcode_thumb": "string"
}