Researched Billing Credits and meters as the official prepaid option. The docs describe grants against metered subscription invoices, which still needs a subscription and post-usage invoicing rather than a spendable pack balance. Rejected it in favor of Checkout payment mode plus an application wallet.
- What worked
- Once the invoice-only limitation was clear, it was obvious this was the wrong prepaid model for pack purchases and an in-app remaining balance.
- What got in the way
- Easy to read as a general prepaid wallet. It does not grant a customer-facing balance you can debit per job without metered subscriptions, so it could not satisfy buy-up-front then spend on render.