# Account Creation

{% hint style="info" %}
This step assumes you have successfully created a new customer record and verified it using [customer-creation](https://docs.offblocks.xyz/developer-guides/step-by-step-guide/customer-creation "mention")and [customer-verification](https://docs.offblocks.xyz/developer-guides/step-by-step-guide/customer-verification "mention") steps of the guide
{% endhint %}

Now that you have created and verified a first customer record, you are able to onboard the customer on OffBlocks accounts. To do so, you need to use `/customers/{customerId}/account` `POST` request.

{% openapi src="<https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media&token=762e0468-4f4f-407e-9281-df4ee98be768>" path="/customers/{customerId}/accounts" method="post" expanded="true" %}
[offblocks-api-spec\_master\_api.yaml](https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media\&token=762e0468-4f4f-407e-9281-df4ee98be768)
{% endopenapi %}

Let's say we want to open a new card account (the only option for the time being) that's using Euro as a base currency (we don't support multi-currency accounts just yet):

```json
{
  "type": "CARD_ACCOUNT",
  "currencies": [
    "EUR"
  ]
}
```

If everything was successful, you will receive a response with status `201 (Created)` which looks similar to the following:

<pre class="language-json"><code class="lang-json"><strong>{
</strong>    "challenge": "NWRmMzU5ZjAtZDI5OS00MGExLTgwMjMtMTdjNzdhNTAxNDRj",
    "createdAt": "2024-01-12T15:07:17.358440283Z",
    "currencies": [
        "EUR"
    ],
    "customerId": "04c5851c-4386-5bd9-9f89-08312f8aee3a",
    "id": "ae61c362-4136-49af-8e01-544457fe265b",
    "status": "initiating",
    "type": "card_account",
    "updatedAt": "2024-01-12T15:07:17.358440283Z"
}
</code></pre>

If everything went well, you will receive an account challenge to sign as a base64 encoded string. This is required to proceed to deployment stage.  Signatures are not currently verified in our Sandbox environment, however they are still required to be submitted.

In order to submit a signed challenge, use a `POST` request to `/accounts/{accountId}/challenge/sign` endpoint.

{% openapi src="<https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media&token=762e0468-4f4f-407e-9281-df4ee98be768>" path="/accounts/{accountId}/challenge/sign" method="post" expanded="true" %}
[offblocks-api-spec\_master\_api.yaml](https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media\&token=762e0468-4f4f-407e-9281-df4ee98be768)
{% endopenapi %}

```json
{
  "ownerId": "eip155:280:0x43158f45b5EbD7b1179130131DF00393928C2691",
  "challenge": "NWRmMzU5ZjAtZDI5OS00MGExLTgwMjMtMTdjNzdhNTAxNDRj",
  "signature": "c2lnbmF0dXJl"
}
```

Please, not that the signature also must be a base64 encoded string. If signature is verified, you will receive an empty response with status code `204 (No Content)`.

If, for any reason, the original challenge is lost or cannot be signed immediately, you can fetch it again using a dedicated endpoint. If we encounter an error during signature validation via `/sign` endpoint, a new challenge will be issued for you to retrieve.

{% openapi src="<https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media&token=762e0468-4f4f-407e-9281-df4ee98be768>" path="/accounts/{accountId}/challenge" method="get" expanded="true" %}
[offblocks-api-spec\_master\_api.yaml](https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media\&token=762e0468-4f4f-407e-9281-df4ee98be768)
{% endopenapi %}

Once the challenge has been successfully signed, we will proceed to deployment stage. The account will be automatically deployed and activated, which you can verify by making a `GET` request to `/accounts/{accountId}`.

{% openapi src="<https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media&token=762e0468-4f4f-407e-9281-df4ee98be768>" path="/accounts/{accountId}" method="get" expanded="true" %}
[offblocks-api-spec\_master\_api.yaml](https://1545901005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTToCQFhAYRMgObGgbSjC%2Fuploads%2FV89o79d3urx40FHQswwW%2Foffblocks-api-spec_master_api.yaml?alt=media\&token=762e0468-4f4f-407e-9281-df4ee98be768)
{% endopenapi %}

```json
{
    "chainId": "eip155:280:0x18102C007e4B4FBED74105E8D1e4FF4545Dbed8f",
    "createdAt": "2024-01-12T15:07:17.35844Z",
    "currencies": [
        "EUR"
    ],
    "customerId": "04c5851c-4386-5bd9-9f89-08312f8aee3a",
    "id": "ae61c362-4136-49af-8e01-544457fe265b",
    "status": "active",
    "type": "card_account",
    "updatedAt": "2024-01-12T15:09:31.118452Z"
}
```

From there we can proceed to issuing cards for the account.