Filter to change the State and Country fields to text fields on the payment billing forms. Requires Event Espresso 4.6.7.p or greater.

billing_form.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter( 'FHEE__EE_Billing_Attendee_Info_Form__state_field', 'billing_locale_text_field', 10, 1 );

add_filter( 'FHEE__EE_Billing_Attendee_Info_Form__country_field', 'billing_locale_text_field', 10, 1 );

function billing_locale_text_field( $original_field ) {
    return new EE_Text_Input( array( 'required' => true, 'html_class' => 'ee-billing-qstn'));
}