Give members of specific level IDs Free Shipping in your WooCommerce store.

my_pmprowc_free_shipping.php

/*
 * Give members of level 1 or 2 Free Shipping when free shipping is available (must set free shipping as an option in store settings).
 * Change $pmprowc_free_shipping_levels = array(1,2); to include level IDs that receive free shipping
*/
function my_pmprowc_free_shipping( $rates, $package ) {
	$pmprowc_free_shipping_levels = array('1','2');
	if(function_exists('pmpro_hasMembershipLevel') && isset( $rates['free_shipping'] ) && pmpro_hasMembershipLevel($pmprowc_free_shipping_levels) )
	{
		// Get Free Shipping array into a new array
		$freeshipping = array();
		$freeshipping = $rates['free_shipping'];
 
		// Empty the $available_methods array
		unset( $rates );
 
		// Add Free Shipping back into $avaialble_methods
		$rates = array();
		$rates[] = $freeshipping;
	}
	else
	{
		// remove free shipping option
		unset( $rates['free_shipping'] );
	}
	return $rates;
}
add_filter( 'woocommerce_package_rates', 'my_pmprowc_free_shipping' , 10, 2 );