# Still Pay > Hosted crypto invoices. Merchants price in USD, payers send crypto to a unique address, Still Pay POSTs a signed webhook when the transfer confirms. Credit the customer only when invoice status is `paid`. Do not fulfill on `underpaid` or `expired`. Merchant API: `Authorization: Bearer sk_live_…` on `/api/v1`. ## Docs - [Markdown docs](/docs.md): invoices, webhooks, HMAC verify, statuses, errors - [Full text](/llms-full.txt): complete dump, same as docs.md - [HTML docs](/docs): human UI