# 8. Check BIN

## Check BIN

<mark style="color:blue;">`GET`</mark> `{{Base Address}}/api/paywall/bin/inquiry`

Sending a request to the provided address above will be sufficient. You can use the 'Base Address' as you wish for both the test environment and the real environment.

{% hint style="info" %}
**Important**: In order to use the query service, you need to send the '**apikeypublic**' and '**apiclientpublic**' parameters in the 'Header' field.<br>

[<mark style="color:green;">**PaymentAPI Address**</mark>](/payment-orchestration-integration-document/environment.md)
{% endhint %}

{% hint style="success" %}
The Paywall BIN inquiry service supports both 6-digit and 8-digit BIN lookups.
{% endhint %}

<table><thead><tr><th width="192">Parameter</th><th width="102">Type</th><th width="139">Compulsory</th><th>Description</th></tr></thead><tbody><tr><td>apikeypublic</td><td>string</td><td>Yes</td><td>The Public Key you have obtained from the merchant panel.</td></tr><tr><td>apiclientpublic</td><td>string</td><td>Yes</td><td>The Public Client you have obtained from the merchant panel.</td></tr><tr><td>binnumber</td><td>string</td><td>Yes</td><td>The first 6 digits of the card for which the payment is to be made.</td></tr></tbody></table>

**Response returned from the service:**

<table><thead><tr><th width="156">Parameter</th><th width="83.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td>ErrorCode</td><td>int</td><td>Error code. Returns '0' if the transaction is successful.</td></tr><tr><td>Result</td><td>bool</td><td>Returns a true or false value. It returns 'true' if the transaction is successful.</td></tr><tr><td>Message</td><td>string</td><td>If the transaction is unsuccessful, this is the specified error message.</td></tr><tr><td>Body</td><td>object</td><td>It returns full if there is an installment option, and empty if not.</td></tr></tbody></table>

{% tabs %}
{% tab title="JSON" %}
{% code overflow="wrap" lineNumbers="true" %}

```json5
{
    "ErrorCodeType": 1,
    "ErrorMessage": null,
    "ErrorCode": 0,
    "Result": true,
    "Message": "",
    "Body": {
        "BinNumber": "51691401",
        "CardBankId": 75,
        "CardBank": "DENİZBANK A.Ş.",
        "CardBrandId": 1,
        "CardBrand": "Master Card",
        "CardFamilyId": null,
        "CardFamily": null,
        "CardKindId": 1,
        "CardKind": "Bireysel Kart",
        "CardTypeId": 2,
        "CardType": "Debit",
        "IsMatchedByEightDigitBin": true, // Bin numarası 8 hane ile eşleşti
        "IsMatchedBySixDigitBin": false // Bin numarası 6 hane ile eşleşti
    }
}
```

{% endcode %}
{% endtab %}
{% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developer.paywall.one/payment-orchestration-integration-document/payment-service/8.-check-bin.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.