Example request

{
  "at_mobiles": [
    "133123456789"
  ],
  "ats": [
    "xxx"
  ],
  "ccs": [
    ""
  ],
  "content": "this is a text content",
  "extra": "{\"enable_duplicate_check\": 1,\"duplicate_check_interval\": 1800}",
  "msgtype": "text",
  "sender": "myWechatBot",
  "simple": true,
  "sync": true,
  "tos": [
    ""
  ]
}