Merge pull request #2553 from ably/EDU-1814-Billing-alerts

EDU-1814-Adds-billing-alert-copy

Author: franrob-projects

content/pricing/billing.textile

@@ -33,3 +33,16 @@ To update your billing details:
 You can update your payment details and view your invoices in this screen.
 
 It's also possible to have your invoices sent to an accounts department by filling in the *Optional billing email address*.
+
+h2(#alerts). Billing alerts
+
+Billing alerts notify you by email when your monthly spending exceeds a set amount if you're on a Standard or Pro package. This feature helps you monitor costs and avoid unexpected charges.
+
+The following steps guide you through setting up billing alerts:
+
+* Log in to your Ably "account.":https://ably.com/login
+* In the "Create new alert":https://ably.com/accounts/any/package#billing-alerts-section section, select the email address from the dropdown list where you want to receive the alert. The available choices depend on your "user role":/docs/account/users#roles.
+** If you are an owner: Yourself and billing users associated with the account.
+** If you are a user with a billing role: Yourself only.
+* Enter a value greater than your base package fee in the *Amount* field. This amount sets the threshold at which you will receive a notification.
+* Click *Create alert* to save your changes.