Jeroen Schmit

InternativeNL

This plugin adds an new IBAN mask to the built-in input masks of Gravity Forms. 
Add this mask to any text field to enforce valid IBAN account numbers in your form.
This plugin uses the <a href="https://github.com/globalcitizen/php-iban" rel="nofollow ugc">php-iban</a> library to validate IBAN account numbers.

Gravity Forms IBAN

Add an IBAN input mask and IBAN validation to your Gravity Form.

Arash Mehrani

This plugin automatically creates a new field for (IBAN Bank Number) in the WooCommerce user account details, allowing your customers to add their Bank IBAN number for get they refund money from the store.
<h4>How it work</h4>
This plugin will: 
* Add new field for (IBAN) in WooCommerce user account details 
* Show users IBAN number on admin dashboard user management page

Add iban field to woocommerce

This plugin automatically creates a new field for (IBAN Bank Number) in the WooCommerce user account details, allowing your customers to add their Ban …

Gravity Forms IBAN vs Add iban field to woocommerce