> For the complete documentation index, see [llms.txt](https://docs.limio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.limio.com/integrations/using-limio-for-salesforce/address-mandatory-fields/custom-address-fields.md).
# Add Custom Fields to Billing and Delivery Address Objects
**LFS version:** requires Limio for Salesforce v11.67 or later
**Limio version requirement**: requires Limio v88 or later
Limio for Salesforce Acquisition flow allows passing additional custom fields to the billing and delivery address objects to be included in the order payload. In order to do so, two string variables are exposed: `customBillingAddressFields` and `customDeliveryAddressFields`.
Use an Assignment element to populate these variables with values. Both `customBillingAddressFields` and `customDeliveryAddressFields` accept a **JSON string,** and the input is validated when a customer submits an order.
Example:
```
customDeliveryAddressFields = '{"custom_field":"custom_value"}';
```
In case of an invalid input formatting, the error message is displayed after clicking Submit Order:
**Note**: billing and delivery custom fields are validated consecutively, so in case both values are incorrectly formatted, the error message will reflect one error at a time. Please, make sure to check both inputs before re-testing.
Variables are added to the order in the very last screen element of the flow - Summary Screen - so make sure to assign values anywhere prior to this step.
---
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