diff --git a/ucloud_pay.py b/ucloud_pay.py
index a1badb0..a347a6a 100644
--- a/ucloud_pay.py
+++ b/ucloud_pay.py
@@ -225,6 +225,8 @@ class ProductOrder(Resource):
             if otp_response != 200:
                 return {"message": "Wrong Credentials"}, 403
 
+            stripe_utils = StripeUtils()
+
             # Validate the given product is ok
             product_id = data["product_id"]
             product = client.get(
@@ -237,8 +239,29 @@ class ProductOrder(Resource):
             logging.debug("Got product {}: {}".format(product.key, product.value))
 
             # Check the user has a payment source added
+            stripe_customer = stripe_utils.get_stripe_customer_from_email(
+                data["email"]
+            )
+
+            if not stripe_customer or len(stripe_customer.sources) == 0:
+                logging.error("{} does not exist in Stripe => no cards".format(
+                    data["email"])
+                )
+                return {"message": "Please register a payment source"}, 400
 
             # Initiate a one-time/subscription based on product type
+            product_obj = product.value
+            if product_obj['type'] == "recurring":
+                logging.debug("Product {} is recurring payment".format(
+                    product_obj["name"])
+                )
+            elif product_obj['type'] == "one-time":
+                logging.debug(
+                    "Product {} is one-time "
+                    "payment".format(product_obj["type"])
+                )
+
+
 
             # If charge successful, create an order object