Currently, WHMCS allows users to view and download invoice PDFs via the client area or admin interface, but there is no official API endpoint for generating or retrieving invoice PDFs programmatically.
I am requesting the addition of an API function that would allow authenticated users (admin or via API credentials) to:
1. Generate an invoice PDF on demand.
2. Retrieve the PDF file via a secure API endpoint.
3. Optionally specify invoice ID and get either a direct download link or base64 content.
4. This would greatly help with custom billing integrations, third-party automation systems, and external reporting tools.
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