Modify memberships that are given to users via Zapier. As written, this will change the billing amount shown to $10/year.

my_pmproza_change_level.php

<?php

// Copy from below here...

/**
 * Modify memberships that are given to users via Zapier.
 * As written, this will change the billing amount shown to $10/year.
 * 
 * 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_pmproza_change_level( $level, $user_id, $old_level_status, $cancel_level ) {
	if ( empty( $_REQUEST['pmpro_zapier_webhook'] ) ) {
		return $level;
	}
	$custom_level = array(
		'user_id'         => $user_id,
		'membership_id'   => $level,
		'code_id'         => '',
		'initial_payment' => 10,
		'billing_amount'  => 10,
		'cycle_number'    => 1,
		'cycle_period'    => 'Year',
		'billing_limit'   => 0,
		'trial_amount'    => 0,
		'trial_limit'     => 0,
		'startdate'       => current_time( 'mysql' ),
		'enddate'         => 'NULL'
	);
	return $custom_level;
}
add_filter( 'pmpro_change_level', 'my_pmproza_change_level', 10, 4 );

Line 34 should be add_filter

Line 34 should be add_filter

Fixed, thanks!