List available topics

List the available topics you can subscribe to.

The following topics are supported:

• ready-product-invoices happens when an invoice is ready to be paid;
• customer-feed happens when a customer is created;
• account-pricing-feed happens when an account pricing object is changed (e.g. a pricing plan);
• customer-pricing-feed happens when a customer pricing object is changed (e.g. a pricing plan is assigned to a customer);
• webhook-test for testing purposes.