Change Fields On Donation Form

add_action( 'wp', 'example_charitable_update_donation_fields' );

function example_charitable_update_donation_fields() {

	// Get the donation fields.

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

	// Get the field we want to update.

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

	// Update the field's label to say "Province" on the donation form and admin form.

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

	$field->set( 'admin_form', 'label', 'Province' );

	// Repeat this for the postcode field.

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

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

	$field->set( 'admin_form', 'label', 'Postal' );

	$fields->register_field( $field );

}