Change Postcode To Zipcode

/**

 * Change the "Postcode" field into a "ZIP Code" field.

 *

 * @param   array[] $fields

 * @return  array[]

 */

add_action(

	'init',

	function ( $fields ) {

		$fields       = charitable()->donation_fields();

		$field        = $fields->get_field( 'postcode' );

		$field->label = 'ZIP Code';

		$field->set( 'donation_form', 'label', 'ZIP Code' );

	},

	11

);