Hide WooCommerce Checkout Fields If No Payment Required

If you care about website performance and easier administration, I recommend using a code snippet plugin like WPCodeBox (or similar) for adding code to your website.

Instructions

Create a new PHP code snippet.
Copy the contents of code snippet below.
Paste the contents into your code snippet.
Review any notes that I’ve provided.
Save and enable the code snippet.
Test.

Snippet

This snippet removes all but the Name and Email Address fields.

<?php 

add_filter( 'woocommerce_checkout_fields', function( $fields ) {
   if ( WC()->cart && ! WC()->cart->needs_payment() ) {
      $free_fields = [];
      foreach ( $fields['billing'] as $key => $value ) {
         if ( in_array( $key, [ 'billing_email', 'billing_first_name' ] ) ) {
            $free_fields['billing'][$key] = $value;
         }
      }
      return $free_fields;
   }
   return $fields;
}, 99999999 );

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