Clicking "Invoice PDF" button on external community page is throwing Invalid Page error

[doyeli]

Problem:

Customer is on ZQuote version 8.0.3 and Z360 4.2 and have a salesforce  Community set up using Napili template.

Invoice PDF used to work fine from this external community but after the SFDC UAT org refresh, clicking Invoice PDF button is throwing "Invalid Page " error.

[doyeli · Accepted solution]

Solution:

Community users who should have access to billing functionality were assigned to a custom  permission set.

The permission set didn't have access to the InvoicePDF visualforce page on production.

It was initially set  in the UAT org, but not in the  production org. So, after the UAT refresh , they lost that permission.

Granting access to Zuora.viewInvoicePdf Visualforce Page to the permission set resolved the issue.