# GPAY\_BIN\_NUMBER

**Type**: `string` **Default**: `"GPAY00"` **Description**: The BIN number used to look up the virtual card record for Garanti Pay (GPay) transactions.

Configured in `settings.py` as a plain Django setting:

```python
GPAY_BIN_NUMBER = "GPAY00"
```

* The value is used during `GPaySelectionPage` processing to retrieve a `BinNumber` object and its associated card from the database. The resulting card information is stored in the checkout session as `card_info` and the order number is assigned.
* If no `BinNumber` record matching this value exists in the database, the order number is reset and `card_info` is cleared, causing the preconditions for `GPayRedirectPage` to fail and routing the user back to the payment option selection step.
* The default value `"GPAY00"` is used when the setting is not explicitly defined in `settings.py`.

**Used in**: `GPaySelectionPage.process_pre_order()` — BIN number lookup for GPay virtual card assignment. Indirectly affects `GPayRedirectPage` preconditions (`check_card_info_not_empty`, `check_order_number_not_empty`).


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