> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/instant-issuance/integrate-d1-api/d1-api-summary.md).

# D1 API summary

## Overview

This page provides a checklist of the D1 API endpoints typically required to integrate 3DS.

{% hint style="info" %}
**Direction** indicates who calls the endpoint:

* **Inbound**: your issuer backend calls the D1 API.
* **Outbound**: the D1 backend calls your issuer backend.
  {% endhint %}

## Required APIs

<table><thead><tr><th>API</th><th width="100">Direction</th><th>Description</th></tr></thead><tbody><tr><td><a href="/pages/nFgAV3BwAfMiOyRhr1Eq#post-oauth2-token">Get authorization token</a></td><td>Inbound</td><td>Get an OAuth 2.0 access token to call the D1 backend.</td></tr><tr><td><a href="/pages/e0ojL7cn2t5soxDw7EP2#post-v2-issuers-issuerid-cards">Create card</a> or <a href="/pages/e0ojL7cn2t5soxDw7EP2#put-v2-issuers-issuerid-cards-cardid">Register card</a></td><td>Inbound</td><td>Create or register a card in the D1 backend.</td></tr><tr><td><a href="/pages/e0ojL7cn2t5soxDw7EP2#post-v2-issuers-issuerid-cards-cardid-operations-renew">Renew card</a></td><td>Inbound</td><td>Renew a card.</td></tr><tr><td><a href="/pages/e0ojL7cn2t5soxDw7EP2#post-v2-issuers-issuerid-cards-cardid-operations-replace">Replace card</a></td><td>Inbound</td><td>Replace a card.</td></tr><tr><td><a href="/pages/e0ojL7cn2t5soxDw7EP2#post-v2-issuers-issuerid-cards-cardid-operations-delete">Delete card</a></td><td>Inbound</td><td>Delete a card from the D1 backend.</td></tr><tr><td><a href="/pages/dDL3rGCv14qmdhWj7fS7#post-notifications-d1-v1-issuers-issuerid-cards-cardid-3ds-notifications">Notify 3DS card operation</a></td><td>Outbound</td><td>Receive 3DS operation notifications (for example, frictionless or challenge outcomes).</td></tr><tr><td></td><td></td><td></td></tr></tbody></table>

## Optional APIs


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