added withQuantity method to checkout

src/Checkout.php

@@ -42,6 +42,8 @@ class Checkout implements Responsable
 
     private ?int $customPrice = null;
 
+    private int $quantity = 1;
+
     public function __construct(private string $store, private string $variant)
     {
     }
@@ -145,6 +147,18 @@ public function withDiscountCode(string $discountCode): self
         return $this;
     }
 
+    public function withQuantity(int $quantity): self
+    {
+        $this->checkoutData['variant_quantities'] = [
+            [
+                'variant_id' => (int) $this->variant,
+                'quantity' => $quantity,
+            ],
+        ];
+
+        return $this;
+    }
+
     public function withCustomData(array $custom): self
     {
         if (

tests/Feature/CheckoutTest.php

@@ -98,3 +98,18 @@
     expect($checkout->url())
         ->toBe('https://lemon.lemonsqueezy.com/checkout/buy/variant_123');
 });
+
+it('can include quantities', function () {
+    $checkout = Checkout::make('store_24398', 'variant_123')
+        ->withName('John Doe')
+        ->withQuantity(2);
+
+    Http::fake([
+        'api.lemonsqueezy.com/v1/checkouts' => Http::response([
+            'data' => ['attributes' => ['url' => 'https://lemon.lemonsqueezy.com/checkout/buy/variant_123']],
+        ]),
+    ]);
+
+    expect($checkout->url())
+        ->toBe('https://lemon.lemonsqueezy.com/checkout/buy/variant_123');
+});