Send a coordinate share message to another player.

Sends a clickable coordinate location to the target player via private chat. The recipient will see the coordinates as a shareable map location they can click to view on their map.

Capitol Building: Default coordinates (499, 497) are the capitol building, which is at the same location on every server.

Use Cases:

• Share your alliance's rally point
• Share enemy base locations
• Share resource tile locations

Requirements:

• Your UID: Find this in your in-game profile settings
• Target UID: The 16-digit UID of the player you want to message

If session_key is provided, uses that session's credentials directly.

Example:

{
    "target_uid": "1109037525001351",
    "server_id": 1364,
    "x": 499,
    "y": 497,
    "msg": "Rally here!"
}