When wechat adds the other party, you don't have to send the added information or reasons to the other party.

How do you know that the other party has received the message? You don't need to know. As long as you send it, the other party will naturally see it. When the invitation is added, it will be displayed in the SMS reminder he received.

You will see that you want to add. You don't have to worry about this, and you don't have to worry about it. If you send a reason to be a friend, the other person will see the text you sent.