Send validation email when assigning membership level via code Paid Memberships Pro

send_validation_email.php

<?php
/**
 * Send validation email when assigning a membership level to a user using PHP code.
 * Extended from example - https://www.paidmembershipspro.com/give-users-a-default-membership-level-at-registration/
 * Adjust code accordingly to your needs, add to PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
add_filter("pmpro_login_redirect", "__return_false");

function my_pmpro_default_registration_level( $user_id ) {
	// Give all members who register membership level 1
	pmpro_changeMembershipLevel( 1, $user_id );

	$key = pmproec_getValidationKey( $user_id );
	update_user_meta( $user_id, 'pmpro_email_confirmation_key', $key );
	
	// Validation URL for email
	$url = home_url("?ui=" . $user_id . "&validate=" . $key);

	// Get user data
	$user = get_user_by( 'ID', $user_id );

	// Let's send an email to the user now to validate their account.
	$pmpro_email = new PMProEmail();
	$pmpro_email->template = 'my_custom_validate_template';
	$pmpro_email->subject = 'Please verify your email address';
	$pmpro_email->body = 'Please validate your email here: ' . $url;

	$pmpro_email->sendEmail( $user->user_email );

}
add_action('user_register', 'my_pmpro_default_registration_level');