Payment methods and invoices

[STUB] This page is established and waiting for content.

Purpose: Shows how to add a payment method and how to find and download invoices. Written for owners, and for administrators with billing access. A procedural companion to plans-and-billing.

Covers: I-156 Payment methods: add card (Stripe); I-157 Invoice list with per-invoice download

Availability: All and Role: owner

Expected captures: 2

Write this article with the boundarylogic-docs-writer skill; this stub is the brief. The skill emits the screenshot requests at write time. Delete the stub when the content lands.