Send a custom checkout email template with a custom subject line per membership level #pmpro

my-pmpro-custom-checkout-email-template-per-level.php

<?php
/**
 * This recipe sets a custom checkout email template and subject line per level.
 *
 * In this example recipe we created a custom email template for level ID's 1 & 2
 * in the "email" folder inside your customization plugin's directory.
 *
 * Note: This recipe and the required email template folders need to be added
 * to a custom plugin and will not work from a third-party plugin that adds
 * php customization recipes to the site.
 *
 * You can add this recipe to your site by creating a custom plugin.
 * 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_custom_checkout_template_per_level( $email ) {

	// Is this a checkout email for the member?
	if ( strpos( $email->template, 'checkout' ) !== false && strpos( $email->template, 'admin' ) === false ) {

		// which level is this email for?
		$level_for_email = $email->data['membership_id'];

		switch ( $level_for_email ) {
			case '1':
				$email->subject = 'Custom subject line for level 1';
				// Be sure to create the checkout_level_1.html email in the file location here.
				$email->body = file_get_contents( dirname( __FILE__ ) . '/email/checkout_level_1.html' );
				break;
			case '2':
				$email->subject = 'Custom subject line for level 2';
				// Be sure to create the checkout_level_2.html email in the file location here.
				$email->body = file_get_contents( dirname( __FILE__ ) . '/email/checkout_level_2.html' );
				break;
		}
	}

	// 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;
}
// Set filter at a later priority than 10
add_filter( 'pmpro_email_filter', 'my_pmpro_email_custom_checkout_template_per_level', 20, 2 );

For custom membership expired templates per level see: https://gist.github.com/ipokkel/2563d3e795a5cb208b7f8c09b693d294

For custom membership expiring reminder per level see: https://gist.github.com/ipokkel/311725d603a36d4fbe45244e4932e690

For a custom cancel email template per level see: https://gist.github.com/ipokkel/9054d94a7d7ab45084c188bf250c7fe3