custom-email-per-level-for-checkout-free.php

<?php
/**
 * Example usage of the pmpro_email_filter hook to customize the checkout_free email per level.
 *
 * 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_email_filter_checkout_free_per_level( $email ) {

	if ( $email->template == 'checkout_free' ) {

		$level_id = $email->data['membership_id'];

		if ( $level_id == 1 ) {
			$email->subject = 'Subject line for level 1';
			$email->body    = 'This is the content/body of the email for members who checked out for level 1';
		}

		if ( $level_id ==  2 ) {
			$email->subject = 'Subject line for level 2';
			$email->body    = 'This is the content/body of the email for members who checked out for level 2';
		}

	}
	
	// Let's check for any remaining email variables and replace them with the data.
	if ( is_array( $email->data ) ) {
		foreach ( $email->data as $key => $value ) {
			if ( 'body' != $key ) {
				$email->body    = str_replace( '!!' . $key . '!!', $value, $email->body );
				$email->subject = str_replace( '!!' . $key . '!!', $value, $email->subject );
			}
		}
	}

	return $email;
}
add_filter( 'pmpro_email_filter', 'my_pmpro_email_filter_checkout_free_per_level', 99, 1 );