---
title: Card Provider Server API
category: reference
---

# Card Provider Server API

This page is the OpenAPI reference for the Card Provider Server (`version 1.0`). Ledger Backend calls these endpoints when a user buys crypto with a debit or credit card inside . Implement them on your backend as described in the [sell-card backend](./sell-card/providers-backend) and [fund-card backend](./fund-card/providers-backend) guides.

The specification below is the source of truth for paths, request bodies, and responses. Those backend guides document `/sell` for the signed fund payload and the `/transaction/{sellId}/status` webhook.

## Cross-references

- [Card integration overview](../card)
- [Sell-card backend](./sell-card/providers-backend)
- [Fund-card backend](./fund-card/providers-backend)
- [Card payload code examples](./sell-card/code-examples)