> 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/secure-card-display/get-started/manage-cards/register-cards-via-api.md).

# Register cards via API

Card registration is a backend-to-backend flow between your **issuer backend** and the **D1 backend**.

You can run it at any time before the card is used in a D1 service.

You can also combine card registration with card creation for the same end user.

As part of registration, your issuer backend provides:

* `cardId`: A unique technical identifier used in the D1 API and D1 SDK. It must not be the PAN or derived from the PAN.
* `cardProductId`: The identifier of the card product.
* PAN and expiry date: Encrypted using JWE.
* `consumerId`: Your issuer backend identifier for the end user who owns the card.

{% hint style="info" %}
If the end user is not registered in D1, D1 can implicitly register the end user from the provided `consumerId`. When D1 needs personal information, it calls your issuer backend using [Get consumer information](https://thales-dis-dbp.stoplight.io/d1-caas/branches/mergeV1V2/80c02eb3c9adf-get-consumer-information).
{% endhint %}

Unlike card creation, card registration does not require an account list.

### Sequence diagram

<figure><img src="/spaces/62lLFDcmLCeqqwmy4Fee/files/WDxQFOg3hDK1NXGUdaIW" alt=""><figcaption><p>Card registration flow between the issuer backend and the D1 backend.</p></figcaption></figure>

After registration, you can use the card across other D1 services, for example:

* [Transaction control](https://thales-dis-dbp.stoplight.io/docs/d1-caas/25aregsmz7a2q-transaction-control)
* [Secure Card Display](https://thales-dis-dbp.stoplight.io/docs/d1-caas/3c8a7e6f0a81a-secure-card-display-introduction)
* [Tokenization](https://thales-dis-dbp.stoplight.io/docs/d1-caas/ad6a9b717d3b9-introduction)
* [Push provisioning](https://thales-dis-dbp.stoplight.io/docs/d1-caas/294f33eaf2378-push-provisioning-introduction)

### API endpoint

Register the card using:

* [Register card](/secure-card-display/integrate-d1-api/d1-api-reference/inbound-api-to-d1/card-api.md#put-v2-issuers-issuerid-cards-cardid)


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