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One prepaid Remyx balance, spent pay as you go. Scope: billing:read / billing:write. See Billing.
Your balance, recent transactions, whether a grant covers you, Checkout availability, and the top-up presets and limits. A service token gets the price list instead.
Returns {url, session_id, amount_usd}; send the browser to url. 409 when Checkout is not configured on the server, 400 for an amount out of range, 403 for anything but a user-scoped token. The Stripe webhook at /billing/stripe/webhook credits the balance once per event.