# Seismic Cards API

## Docs

- [API Reference: All Seismic Cards API Endpoints](https://docs.seismic-cards.systems/api-reference.md): Complete reference for every Seismic Cards API v1 endpoint — authentication, accounts, cardholders, BINs, budgets, transfers, cards, and transactions.
- [Error Codes: Seismic Cards API Error Reference](https://docs.seismic-cards.systems/errors.md): Every Seismic Cards API error code, its HTTP status, and what to do about it — including KYC, card lifecycle, funding, and webhook retry errors.
- [Get Started: Authenticate with the Seismic Cards API](https://docs.seismic-cards.systems/getting-started.md): Get your API credentials, complete the OAuth 2.0 two-step authorization flow, and make your first authenticated call to the Seismic Cards API.
- [Seismic Cards API: Virtual Card Issuance Platform](https://docs.seismic-cards.systems/index.md): Issue Visa and Mastercard virtual cards to your users via API. PCI-compliant card issuance with KYC, budgets, spending controls, and real-time webhooks.
- [Seismic Cards API: Issue Virtual Cards via API](https://docs.seismic-cards.systems/introduction.md): Issue Visa and Mastercard virtual cards via API. Seismic covers sub-accounts, KYC, budgets, spending controls, webhooks, and PCI-compliant card display.
- [Issue a Virtual Card: End-to-End Walkthrough](https://docs.seismic-cards.systems/issuing-a-card.md): Go from zero to a usable virtual Visa card for your end user in three phases: onboarding, resource provisioning, and card issuance.
- [Display Card Details Securely with the PCI Widget](https://docs.seismic-cards.systems/pci-widget.md): Use the Seismic PCI Widget to render a card's full PAN, CVV, and expiry in iframes hosted on Seismic's PCI domain — keeping your app in SAQ A scope.
- [Webhooks: Receive Real-Time Seismic Card Events](https://docs.seismic-cards.systems/webhooks.md): Configure your endpoint, verify HMAC-SHA256 signatures, and handle all eight Seismic webhook events — from KYC decisions to card transactions.

## OpenAPI Specs

- [openapi](https://docs.seismic-cards.systems/api-reference/openapi.json)