# api

## Pages

- [OrderCard API](https://docs.ordercard.io/api/index.md) — The OrderCard API for vaulted cards, gateways, transactions and webhook endpoints.
- [Authentication](https://docs.ordercard.io/api/authentication/index.md) — Secret and publishable keys, environments, and the permissions a key carries.
- [Conventions](https://docs.ordercard.io/api/conventions/index.md) — Amounts, ids, metadata, idempotency, pagination and rate limits.
- [Customers](https://docs.ordercard.io/api/customers/index.md) — Your customers, with OrderCard's id and your own reference. Group cards and transactions by them.
- [Errors](https://docs.ordercard.io/api/errors/index.md) — The error shape, HTTP statuses, and what each error code means.
- [Gateways](https://docs.ordercard.io/api/gateways/index.md) — Connect your payment gateway accounts, test them, and quote surcharges.
- [Payment methods](https://docs.ordercard.io/api/payment-methods/index.md) — Vaulted cards, addressed by their token. Read, update, retain and redact them.
- [Transactions](https://docs.ordercard.io/api/transactions/index.md) — Charge, authorize and verify vaulted cards, then capture, void and refund.
- [Webhook endpoints](https://docs.ordercard.io/api/webhook-endpoints/index.md) — Manage the URLs OrderCard posts events to.