> ## Documentation Index
> Fetch the complete documentation index at: https://developer.fin.com/llms.txt
> Use this file to discover all available pages before exploring further.

# May 01, 2026

> Changelog for May 01, 2026

## ✨ New Features

### Country Codes

1. **New Postal Code Object in `GET /v1/countries`**
   Each country object in the response now includes a `postal_code` object with two fields:
   * `required` — boolean indicating whether a postal code is mandatory for that country
   * `regex` — validation pattern for the expected postal code format; `null` for countries where postal codes are not applicable

## 🛠️ Improvements

### Customers

1. **Postal Code Validation on Submission**
   Address fields that include a postal code are now validated against the `regex` pattern of the specified country at the time of submission. Invalid formats are rejected with a descriptive error, reducing the likelihood of triggering a Request for Information (RFI) due to malformed address data.

## 🐞 Bug Fixes

### Customers

1. **Business Customer Onboarding Flow Stability**
   Resolved issues affecting the onboarding flow for certain business entity types. Affected entity types now progress through onboarding steps correctly without unexpected errors or stalled states.