curl --request POST \
  --url https://api.example.com/follow/toggle \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '
{
  "targetUserId": 123,
  "currentFollowing": true
}
'

{
  "success": true,
  "message": "<string>",
  "action": "followed"
}