Exclude the default level billing price from payment plan radio options at checkout

my_pmpropp_exclude_default_level_price.php

<?php // copy from below.
/**
 * Exclude the default level billing price from payment plans at checkout
 *
 * 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/
 */
function my_pmpropp_exclude_default_level_price( $include_level_price, $level_id ) {
	// Bail if level price is already excluded.
	if ( ! $include_level_price ) {
		return $include_level_price;
	}

	// Exclude the default level pricing as a payment plan for the following level IDs.
	$exclude_level_price_levels = array( 1 );

	if ( in_array( $level_id, $exclude_level_price_levels ) ) {
		$include_level_price = false;
	}

	return $include_level_price;
}
add_filter( 'pmpropp_include_level_pricing_option_at_checkout', 'my_pmpropp_exclude_default_level_price', 10, 2 );