docs/cloud: add receipt billing email docs

cloud docs for lux PR [#2327](https://github.com/hasura/lux/pull/2327).

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Rikin Kachhia <54616969+rikinsk@users.noreply.github.com>
GitOrigin-RevId: 0bb445712c0c91c30f60eaf648d5bfdf4e9b2ec8

docs/graphql/cloud/billing/index.rst

@@ -28,4 +28,5 @@ Details
   :titlesonly:
 
   payment-methods
-  credits
+  credits
+  receipts

docs/graphql/cloud/billing/receipts.rst

@@ -0,0 +1,55 @@
+.. meta::
+   :description: Hasura Cloud receipts
+   :keywords: hasura, cloud, docs, payment, receipts
+
+.. _receipts:
+
+Receipts
+========
+
+.. contents:: Table of contents
+  :backlinks: none
+  :depth: 1
+  :local:
+
+Introduction
+------------
+
+Receipts, against successful payment of invoices for each billing cycle, are mailed to the email associated with your Hasura Cloud account.
+
+If you wish to receive receipts on another email, in addition to your account's default email, please configure a billing email. 
+
+Configure billing email
+-----------------------
+
+Go to the billing section and click on ``Invoice Settings``. 
+
+.. thumbnail:: /img/graphql/cloud/billing/invoice_settings.png
+   :alt: invoice settings
+
+Click on ``Billing Email`` and enter the email you want to receive receipts on. 
+
+.. thumbnail:: /img/graphql/cloud/billing/configure_billing_email.png
+   :alt: configure billing email
+   :width: 437px
+
+Click ``Save``. 
+
+For all payments made, receipt will also be mailed to the billing email in addition to your account's default email. 
+
+Delete billing email
+--------------------
+Go to the billing section and click on ``Invoice Settings``. 
+
+.. thumbnail:: /img/graphql/cloud/billing/invoice_settings.png
+   :alt: invoice settings
+
+Click on ``Billing Email`` and click ``Remove billing email``. 
+
+.. thumbnail:: /img/graphql/cloud/billing/delete_billing_email.png
+   :alt: delete billing email
+   :width: 437px
+
+
+
+