A recipient needs to open a document you sent them. They have no account, and you do not want them to create one. The document is sensitive, for example a medical report, so it must be delivered in the sender's branding, it must reflect the current state of the case, and it must be revocable the moment something changes. A static link cannot do all three at once.
Webhook integrations look simple on the surface: expose an HTTP endpoint, accept JSON, start some internal processing. In practice they often fail in production because of timeouts, missing validation, weak security, or no clear ownership of configuration.
HTML-to-PDF rendering fails once multi-page layouts, dynamic content, and page numbers are involved. Puppeteer can generate PDFs out of HTML-templates with stable page numbers, but only when its header and footer templates are used correctly.
Following you will find a working approach for dynamic multi-page PDFs with clean page numbers using NodeJS Chromium Puppeteer's header and footer templates.