diff --git a/Sources/src/main/kotlin/allin/entities/UserEntity.kt b/Sources/src/main/kotlin/allin/entities/UserEntity.kt
index a620a10..8a99436 100644
--- a/Sources/src/main/kotlin/allin/entities/UserEntity.kt
+++ b/Sources/src/main/kotlin/allin/entities/UserEntity.kt
@@ -45,6 +45,11 @@ object UsersEntity : Table<UserEntity>("utilisateur") {
         database.Execute(request)
     }
 
+    fun modifyCoins(user: String, cost : Int){
+        val request = "UPDATE utilisateur SET coins = coins - $cost WHERE username = '$user';"
+        database.Execute(request)
+
+    }
 
     fun getUserByUsernameAndPassword(login: String): Pair<UserDTO?, String?> {
         return database.from(UsersEntity)