feat: add stripe webhook

purchase/models.py

@@ -15,10 +15,23 @@ logger = lg.getLogger(__name__)
 
 
 class CoursePurchase(models.Model):
+    class Status(models.TextChoices):
+        INITIATED = "initiated", "Initiated"
+        PENDING = "pending", "Pending"
+        PAID = "paid", "Paid"
+        REFUNDED = "refunded", "Refunded"
+        FAILED = "failed", "Failed"
+
     user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
     course = models.ForeignKey("home.CoursePage", on_delete=models.CASCADE)
     purchased_at = models.DateTimeField(auto_now_add=True)
     refunded = models.BooleanField(default=False)
+    status = models.CharField(
+        max_length=20,
+        choices=Status.choices,
+        default=Status.INITIATED,
+    )
+    stripe_checkout_session_id = models.CharField(max_length=255, blank=True, null=True)
 
     def mock_refund(self):
         self.refunded = True