Add PayPal support for add-on and gift voucher checkout

app/Models/GiftVoucher.php

@@ -15,6 +15,8 @@ class GiftVoucher extends Model
 
     use SoftDeletes;
 
+    public const STATUS_PENDING = 'pending';
+
     public const STATUS_ISSUED = 'issued';
 
     public const STATUS_REDEEMED = 'redeemed';
@@ -35,6 +37,8 @@ class GiftVoucher extends Model
         'lemonsqueezy_order_id',
         'lemonsqueezy_checkout_id',
         'lemonsqueezy_variant_id',
+        'paypal_order_id',
+        'paypal_capture_id',
         'coupon_id',
         'expires_at',
         'redeemed_at',
@@ -89,6 +93,10 @@ class GiftVoucher extends Model
 
     public function canBeRedeemed(): bool
     {
+        if ($this->status !== self::STATUS_ISSUED) {
+            return false;
+        }
+
         return ! $this->isRedeemed() && ! $this->isRefunded() && ! $this->isExpired();
     }