Client self-fill

Self-fill is a feature that lets your client provide their own purchaser details on an invoice. This is useful when you don't have the client's full billing information -- their legal business name, mailing address, or business number.

Instead of asking your client for these details over email or chat, you can send them a link and they fill in a simple form directly on the invoice.

Each invoice has a special purchaser link (e.g. biller.ca/i/abc123token) that opens a form for the purchaser details. Here's the flow:

1. You create an invoice from a payment as usual
2. You share the purchaser link with your client (via email, text, or chat)
3. Your client opens the link and sees a form with fields for their name, address, and business number
4. Your client submits the form -- no Biller account or sign-in is needed
5. The invoice is updated with the client's details, and you receive a notification

To get the self-fill link, open the invoice and click "Purchaser Link". The link is copied to your clipboard, ready to paste into a message.

The self-fill link is different from the public invoice link. The public link (inv/...) shows the invoice in read-only mode. The purchaser link (i/...) shows an editable form for the client's details only.

Each purchaser link contains a unique token, so only someone with the link can access the form.