The Real Madrid striker has successfully disputed and recovered the €55m that was owed to him from his last season at PSG.
The ruling was made by the legal commission of the French Professional Soccer League.
The decision includes a demand that PSG pay Mbappe in full the outstanding wages within a week.
However, PSG say they are now taking the case to the law courts. A club statement read: "(The ruling) must now be challenged in another legal forum, to which Paris Saint-Germain is delighted to present all the facts in the coming months and years."