Launch Stripe billing lifecycle

Problem

Dataface has no billing system. Users cannot sign up for a paid plan, manage subscriptions, or have their access gated by payment status. The Stripe integration needs to cover the full lifecycle: product/price catalog matching the approved pricing model, checkout flow for new subscriptions, webhook-driven state sync so the Dataface Cloud app knows a user's plan status in real time, and handling of upgrades, downgrades, cancellations, and failed payments. Without this, there is no revenue path and the product cannot launch publicly.

Context

Possible Solutions

Plan

Implementation Progress

• Confirm scope and acceptance with milestone owner.

• Milestone readiness signal is updated.

• Track blockers and mitigation owner.

Review Feedback

• Review cleared