# 5 Domains API: How to retrieve TLD specific customer additional data
*This is a series of articles dedicated to demonstrating how to get acquainted with Openprovider Zones API methods.* *To get more information about our API in general, please use our [documentation portal](http://docs.openprovider.com) as your reference.*
In the previous article, we have covered [additional domain fields](https://openprovider.help/books/api-plugins/page/4-domains-api-how-to-retrieve-tld-specific-data) that are required by some domain registries for a given TLD.
Apart from domain-specific attributes there also can exist customer(handle) specific data. For the very purpose of requesting those fields, one can utilize the following endpoint:
Use the endpoint path below. The base URL is determined by both the target environment and the API version.
```
GET {base_url}/domains/additional-data/customers
```
REQUEST VALUES
| **Name** | **Type** | **Description** |
| domain.name | string | **Optional.** |
| domain.extension | string | **Required.** |
REQUEST EXAMPLE
```
curl -X GET \
'https://api.openprovider.eu/v1beta/domains/additional-data/customers/?domain.extension=ru' \
-H 'Authorization: Bearer eca82663f*******76d063d8f6196'
```
RESPONSE EXAMPLE
```
{
"code": 0,
"desc": "",
"data": [
{
"name": "company_name_cyrillic",
"description": "Company name in Cyrillic",
"required": false,
"type": "text"
},
{
"name": "company_name_latin",
"description": "Company name in Latin",
"required": false,
"type": "text"
},
{
"name": "first_name_cyrillic",
"description": "First name in Cyrillic",
"required": false,
"type": "text"
},
{
"name": "first_name_latin",
"description": "First name in Latin",
"required": false,
"type": "text"
},
{
"name": "last_name_cyrillic",
"description": "Last name in Cyrillic",
"required": false,
"type": "text"
},
{
"name": "last_name_latin",
"description": "Last name in Latin",
"required": false,
"type": "text"
},
{
"name": "middle_name_cyrillic",
"description": "Middle name in Cyrillic",
"required": false,
"type": "text"
},
{
"name": "middle_name_latin",
"description": "Middle name in Latin",
"required": false,
"type": "text"
},
{
"name": "passport_issue_date",
"description": "Passport issue date",
"required": false,
"type": "text"
},
{
"name": "passport_issuer",
"description": "Passport issuer",
"required": false,
"type": "text"
},
{
"name": "passport_series",
"description": "Passport series",
"required": false,
"type": "text"
},
{
"name": "passport_number",
"description": "Passport number",
"required": false,
"type": "text"
},
{
"name": "tax_payer_number",
"description": "Tax payer number",
"required": false,
"type": "text"
},
{
"name": "mobile_phone_number",
"description": "Mobile phone number with SMS",
"required": false,
"type": "text"
},
{
"name": "postal_address_cyrillic",
"description": "Postal address",
"required": false,
"type": "text"
},
{
"name": "legal_address_cyrillic",
"description": "Legal address",
"required": false,
"type": "text"
},
{
"name": "birth_date",
"description": "Birth date is required",
"required": false,
"type": "text"
},
{
"name": "is_private_enterpreneur",
"description": "Whether the contact is the private enterpreneur.",
"required": false,
"type": "check"
}
]
}
```
RESPONSE VALUES
| **Name** | **Type** | **Description** |
| name | string | Name of the field |
| required | Whether the field is mandatory or optional |
| type | Field type, e.g. text, check, select, multi-select |
| options | Possible values & value descriptions |
| description | Description of the field |