There’ll be no impact on your credit file if you paid on the same day.
You actually have 2 weeks before we’ll report it as a missed payment on your credit file - but it’s still best to catch up as soon as possible (if you can) since it can still have an impact on our internal credit decisioning before this. There’ll have been no impact for you though since you caught up the same day 
We’ll look at the wording in the initial message to try make it clearer.