Hide WooCommerce Checkout Fields If No Payment Required

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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 );

<?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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