> For the complete documentation index, see [llms.txt](https://developers.citrusad.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.citrusad.com/integration/reference/syncing-customer-data-via-api-1.md).

# Syncing customer data via API

{% hint style="info" %}
Epsilon Retail Media's documentation is now centralized with our knowledgebase!

For up to date guides, please view [this page](https://help.citrusad.com/retail-media-interface/integration/data-api/customer-data/syncing-customer-data-via-api-1) in the new Integration APIs space of our documentation.
{% endhint %}

## Sending customer data to Epsilon Retail Media

To send customer data to Epsilon Retail Media, use a command similar to the one below. Note that the data in the `customers` field is dummy data, and is provided here as an example only.

{% hint style="info" %}
All `customer` object fields are optional. If you push a `customer` object without any field values, a new `id` will be created, so don’t specify an `id` if you are creating `customer` objects.

All values in the `targetingData` field are arbitrary and configurable by the retailer. Please visit the reference page for more information.
{% endhint %}

```http
POST $BASE_URL/v1/customers HTTP/1.1
accept: application/json
content-type: application/json
Authorization: Basic <API_KEY>
{
    "customers": [
        {
            "id": "i4358f9b-bbb9-49fb-93fe-3ad481ce564",
            "targetingData": {
            "customer_type": "Corporate"
            }
        }
    ]
}
```

If successful, the following object will be returned:

```json
{
    "customers": [
        {
            "targetingData": {
                "customer_type": "Corporate"
            },
            "gender": "Other",
            "teamId": "9be784a8-22fc-4315-a335-b7d2c2494f0a",
            "postcode": "",
            "suburb": "",
            "id": "i4358f9b-bbb9-49fb-93fe-3ad481ce564",
            "yearOfBirth": 0
        }
    ]
}
```

## Syncing multiple customers

If you are syncing multiple customers, you can send up to 100 items as a batch with each request. The number of requests you can make is unlimited.

The customer payload order pushed is the same order as the result returned, making it possible for the data to remain congruent with the customer representation the integrator maintains in their backend.

```http
POST $BASE_URL/v1/customers HTTP/1.1
accept: application/json
content-type: application/json
Authorization: Basic <API_KEY>
{
    "customers": [
        {
            "id": "i4358f9b-bbb9-49fb-93fe-3ad481ce564",
            "targetingData": {
            "customer_type": "Corporate"
            }
        },
        {
            "id": "c7792468-07ea-4cc3-9b1a-975bb43dfa02",
            "targetingData": {
            "customer_type": "Retail"
            }
        }
    ]
}
```

If successful, the following object will be returned:

```json
{
    "customers": [
        {
            "targetingData": {
                "customer_type": "Corporate"
            },
            "gender": "Other",
            "teamId": "9be784a8-22fc-4315-a335-b7d2c2494f0a",
            "postcode": "",
            "suburb": "",
            "id": "i4358f9b-bbb9-49fb-93fe-3ad481ce564",
            "yearOfBirth": 0
        },
        {
            "targetingData": {
                "customer_type": "Retail"
            },
            "gender": "Other",
            "teamId": "9be784a8-22fc-4315-a335-b7d2c2494f0a",
            "postcode": "",
            "suburb": "",
            "id": "c7792468-07ea-4cc3-9b1a-975bb43dfa02",
            "yearOfBirth": 0
        }
    ]
}
```

{% hint style="warning" %}
`gender`,`postcode`,`suburb`,`yearOfBirth` fields

Please note these fields are no longer used and are only remaining for historic integrations.
{% endhint %}

### Ingesting bulk customer data

When integrating, we recommend that you send your first batch of customer data as a file for ingestion, as the API accepts batches of 100 at a time.