---
title: Handlers and helpers with custom address fields
slug: configured-commerce/docs/handlers-and-helpers-associated-with-custom-address-fields
docTags: 
createdAt: 2026-08-13T10:46:20.000Z
---

The data for the configurable address fields are populated within the `BillTo` and `ShipTo` handler chains. The following `CustomerHelper` methods are actually responsible for aggregating, formatting, and returning validating information for use by the `BillTo` and `ShipTo` address forms on the Storefront.

```csharp
CustomerValidationDto PopulateBillToValidation(IUnitOfWork unitOfWork, GetCustomerSettingsResult settings, Customer billTo);
CustomerValidationDto PopulateShipToValidation(IUnitOfWork unitOfWork, GetCustomerSettingsResult settings, Customer billTo, Customer shipTo, bool isNew = false);
```

These methods are currently used in the `BillTo` and `ShipTo` handler chains. An example of their use can be seen below.

```csharp
var userAndBillToResult = this.CustomerHelper.GetUserAndBillTo(
    unitOfWork, // This should be injected in the constructor.
    result, // This is returned by the handler chain.
    ... // The rest of the arguments should come from a parameter to the handler.
);
var customerSettings = this.HandlerFactory.GetHandler<IHandler<GetSettingsParameter, GetCustomerSettingsResult>>().Execute(
    unitOfWork,
    new GetSettingsParameter(),
    new GetCustomerSettingsResult());
  
this.CustomerHelper.PopulateBillToValidation(
    unitOfWork,
    customerSettings,
    userAndBillToResult.BillTo);
```

If you want to get access to the generated validation data, an easy way is to inject a custom handler into the chain of responsibility. The following handlers populate validation data for use by either the `BillTo` or `ShipTo` address forms.

| Handler          | Order | Comment                                           |
| ---------------- | ----- | ------------------------------------------------- |
| GetBillToHandler | 500   | Populates validation for the BillTo address form. |
| GetShipToHandler | 500   | Populates validation for the ShipTo address form. |

Below is an example custom handler that gets access to the generated validation data:

```csharp
[DependencyName("ModifyBillToValidationHandler ")]
public class ModifyBillToValidationHandler : HandlerBase<GetBillToParameter, GetBillToResult>
{
    public override int Order => 501; // The order number must be higher to come after the GetBillToHandler in the handler chain.
 
    public override GetBillToResult Execute(IUnitOfWork unitOfWork, GetBillToParameter parameter, GetBillToResult result)
    {
        // You can modify the validation data here.
        // result.Validation now holds the validation data populated by the GetBillToHandler
    }
}
```