Coiour match on one door is not great and now I can’t unsee it ! No damage just a repaint I think, what would be a rough ball park? Car is only a year old so paint still in good shape otherwise.
You will need to take it round bodyshops in your area so you would be better telling us where you are & seeing if anyone has any recommendations. Worst case you will need the side of the car resprayed to be sure of the match.
The reason why its a poor colour match is because the "door" has been painted. If you want an invisible repair you will need the panels either side blended. I would imagine with no real details of the job you could pay between £500-1500 depending where you take it.