Updating the get_payment_gateway_url method

This change is proposed as on_payment_authorized method defined in any doctype for which the payment is made isn't getting triggered.

frappe#12756

frappe/website/doctype/web_form/web_form.py

@@ -216,8 +216,8 @@ def get_payment_gateway_url(self, doc):
 				"amount": amount,
 				"title": title,
 				"description": title,
-				"reference_doctype": "Web Form",
-				"reference_docname": self.name,
+				"reference_doctype": doc.doctype,
+				"reference_docname": doc.name,
 				"payer_email": frappe.session.user,
 				"payer_name": frappe.utils.get_fullname(frappe.session.user),
 				"order_id": doc.name,