Url

http://battlelog.battlefield.com/bf3/comcenter/sendChatMessage/ (Constants.URL_CHAT_SEND)

Headers

X-Requested-With => XMLHttpRequest

Post data

message => {chat message to be sent}
chatId => {unique ID for the chat}
post-check-sum => {checksum for the user}

Notes

chatId is retrieved via API: Get chat with user X

Response

{
  "data": {}, 
  "message": "", 
  "type": "success"
}