Disable PMPro Invoice emails per level.

pmpro-disable-invoice-email-per-level.php

<?php
/**
 * Disable the PMPro invoice email for specified levels.
 *
 * 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_pmpro_disable_invoice_email_per_level( $recipient, $email ) {

	// Set levels to disable emails for
	$disable_invoice_levels = array( 1 ); // e.g. array( 1, 2, 3 ) or array( 1 )

	if ( $email->template == 'invoice' ) {           //use this to check for a certain template
		$user  = get_user_by( 'login', $email->data['user_login'] );
		$level = pmpro_getMembershipLevelForUser( $user->ID );

		if ( ! empty( $level ) && ! empty( $level->id ) && in_array( $level->id, $disable_invoice_levels, true ) ) {
			$recipient = null;
		}
	}
	return $recipient;
}
add_filter( 'pmpro_email_recipient', 'my_pmpro_disable_invoice_email_per_level', 10, 2 );