Give members of specific level IDs Free Shipping on orders above $75 in your WooCommerce store.

my_pmprowc_free_shipping_example.php

<?php // Do not copy this line

/**
 * Add the following code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * 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 ) {

    $free_shipping_allowed = false;

	$pmprowc_free_shipping_levels = array( '1', '2' );

	$free_shipping_key = "";
	foreach( $rates as $key => $val ){
		if( strpos( $key, 'free_shipping' ) !== false ){
			$free_shipping_key = $key;
		}
	}

    $minimum_order_amount = 75;
    $cart_total = WC()->cart->get_total();
    if ( $cart_total > $minimum_order_amount ) {
        $free_shipping_allowed = true;
    }

	if(function_exists('pmpro_hasMembershipLevel') && isset( $rates[$free_shipping_key] ) && pmpro_hasMembershipLevel($pmprowc_free_shipping_levels) && free_shipping_allowed )
	{
		// Get Free Shipping array into a new array
		$freeshipping = array();
		$freeshipping = $rates[$free_shipping_key];
 
		// 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_key] );
	}
	
	return $rates;
}

add_filter( 'woocommerce_package_rates', 'my_pmprowc_free_shipping' , 10, 2 );