Remove user fields at checkout page. Skip required fields check as well.

skip_user_fields.php

<?php 
/**
 *
 * Custom recipe to hide user fields at checkout
 *
 * link: TBD
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * 
 */
 
 //hide the user fields if the level is number 6
function custom_pmpro_checkout_boxes_fields() {
	//get the level
	$level = pmpro_getLevelAtCheckout();
	//if the level is 5 (Gift 1 Year USLA Membership), hide the user fields
	if($level->id == 5) {
		// remove pmpro_checkout_boxes_fields action
		remove_action('pmpro_checkout_boxes', 'pmpro_checkout_boxes_fields');
		return;
	}
}

add_action( 'pmpro_checkout_boxes', 'custom_pmpro_checkout_boxes_fields', 9, 0 );


function custom_pmpro_remove_registration_user_fields_checks() {
	$level = pmpro_getLevelAtCheckout();
	//Gift 1 Year USLA Membership
	if($level->id == 5) {
		remove_filter( 'pmpro_registration_checks', 'pmpro_registration_checks_for_user_fields' );
	}
}

add_action('pmpro_checkout_after_parameters_set', 'custom_pmpro_remove_registration_user_fields_checks', 10, 0);