Simplify WooCommerce checkout fields for free checkouts

wc-free-checkout-fields.php

<?php

function sv_free_checkout_fields() {
	
	global $woocommerce ; 
	
	// Bail we're not at checkout, or if we're at checkout but payment is needed
	if ( ! is_checkout() || ( is_checkout() && WC()->cart->needs_payment() ) ) {
		return;
	}
	
	if ( $woocommerce->cart->total != 0 ) {
		return;
	}
	
	if ( WC_Subscriptions_Cart::cart_contains_subscription() ) {
		return;
	}
	
	// remove coupon forms since why would you want a coupon for a free cart??
	remove_action( 'woocommerce_before_checkout_form', 'woocommerce_checkout_coupon_form', 10 );
	
	// Remove the "Additional Info" order notes
	add_filter( 'woocommerce_enable_order_notes_field', '__return_false' );

	// Unset the fields we don't want in a free checkout
	function unset_unwanted_checkout_fields( $fields ) {
	
		// add or remove billing fields you do not want
		// list of fields: http://docs.woothemes.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/#section-2
		$billing_keys = array(
			'billing_company',
			'billing_phone',
			'billing_address_1',
			'billing_address_2',
			'billing_city',
			'billing_postcode',
			'billing_country',
			'billing_state',
		);

		// unset each of those unwanted fields
		foreach( $billing_keys as $key ) {
			unset( $fields['billing'][$key] );
		}
		
		return $fields;
	}
	add_filter( 'woocommerce_checkout_fields', 'unset_unwanted_checkout_fields' );
	
	// A tiny CSS tweak for the account fields; this is optional
	function print_custom_css() {
		echo '<style>.create-account { margin-top: 6em; }</style>';
	}
	add_action( 'wp_head', 'print_custom_css' );
}
add_action( 'wp', 'sv_free_checkout_fields' );

@JudeRosario - There appears to be a bug with the latest version of WooCommerce 3.x. Even though billing fields are unset upon checkout WooCommerce still has the fields set to "require" somehow. When a customer completes checkout it shows an error that the unset fields are required.

This code dosen't works for me. It displays the errors.

Hello, i also encountered the validation errors. In my case, the checkout was done by an ajax call, so the unset_unwanted_checkout_fields was never added to the filter woocommerce_checkout_fields. I already needed to adapt the line if ( ! is_checkout() || ( is_checkout() && WC()->cart->needs_payment() ) ) for my use case, and finally i did it.