Laravel, Creating unique order on foreach

I know it should be simple :(

My problem is, I have an app for libraries and students, so libraries can have many books in their library this is the tables.

  /**
     * Run the migrations.
     */
    public function up(): void
    {
        Schema::create('books', function (Blueprint $table) {
            $table->id();
            $table->string('book_name')->unique()->nullable();
            $table->string('author_name')->nullable();
            $table->string('edition_number')->nullable();
            $table->string('volume_number')->nullable();
            $table->timestamps();
        });
    }

public function up(): void
    {
        Schema::create('libraries', function (Blueprint $table) {
            $table->id();
            $table->string('name')->unique()->nullable();
            $table->string('phone')->unique()->nullable();
            $table->string('CR')->nullable();
            $table->string('district')->nullable();
            $table->string('city')->nullable();
            $table->string('google_maps')->nullable();

            $table->foreignIdFor(User::class, 'user_id')
                ->constrained('users', 'id')
                ->cascadeOnDelete();
            $table->timestamps();
        });
    }

 public function up(): void
    {
        Schema::create('book_library', function (Blueprint $table) {
            $table->id();
            $table->string('qty')->nullable();
            $table->decimal('price', 10, 2)->nullable();
            $table->text('offer')->nullable();

            $table->foreignIdFor(Book::class, 'book_id')
                ->constrained('books', 'id')
                ->cascadeOnDelete();

            $table->foreignIdFor(Library::class, 'library_id')
                ->constrained('libraries', 'id')
                ->cascadeOnDelete();
        });
    }

As you can see every libeary can have the same book.

where is the problom here:

 public function store(Request $request)
    {
        try {
            DB::transaction(function () use ($request) {
                foreach ($request->carts as $book) {
                    foreach ($book['books'] as $libraryBook) {
                        $order = Order::firstOrCreate(
                            [
                                'library_id' => $book['library_id'],
                                'user_id' => $book['user_id'],
                            ],
                            [
                                'total_payment' => 0
                            ]
                        );
                        $detail = Orderdetail::create([
                            'order_id' => $order->id,
                            'book_library_id' => $book['book_library_id'],
                            'book_id' => $libraryBook['book_id'],
                            'price' => $libraryBook['price'],
                            'total_price' => $libraryBook['price']
                        ]);

                        $order->increment('total_payment', $libraryBook['price']);
                    }
                    if (!$order->latestStatus(Order::STATUS['sent_to_library']['key'])) {
                        $order->setStatus(Order::STATUS['sent_to_library']['key']);
                    }
                    BookLibrary::findOrFail($detail->book_library_id)->decrement('qty');
                }

                $request->user()->carts()->delete();
            });
            return redirect()->route('user.order.index');
        } catch (\Exception $e) {
            Log::error($e);
        }
    }

I here

$order = Order::firstOrCreate(
                            [
                                'library_id' => $book['library_id'],
                                'user_id' => $book['user_id'],
                            ],
                            [
                                'total_payment' => 0
                            ]
                        );

I want to create uniqe order even if the order exists, i mean the student could add to card book A and place order order id now is 1, and than same user add the book A again to the cart and place order i want a new order not updating the exist order. But also if he adds more then one book it will keep creating orders if I change firstOrCreate to create!!

will appropriate your help.