Easy Digital Downloads - Manual Purchases. Create a new user account when making a manual payment

gistfile1.php

<?php

function sumobi_eddmp_create_payment( $data ) {
	if ( wp_verify_nonce( $data['edd_create_payment_nonce'], 'edd_create_payment_nonce' ) ) {

		// email address of user
		$email_address = $data['user'];

		// check to see if a user account doesn't already exist with email address 
		$user_id = username_exists( $email_address );

		// user doesn't exist, let's create it
		if ( ! $user_id && email_exists( $user_id ) == false ) {

			// Generate the password and create the user
			$password = wp_generate_password( 12, false );
			$user_id = wp_create_user( $email_address, $password, $email_address );

			// return if user_id already exists
			if ( is_wp_error( $user_id ) ) {
				return;
			}
			
			$first_name = isset( $data['first'] ) ? $data['first'] : '';
			$last_name = isset( $data['last'] ) ? $data['last'] : '';

			// create user with information entered at checkout
			wp_update_user(
				array(
					'ID'			=> $user_id,
					'first_name'	=> $first_name,
					'last_name'		=> $last_name,
					'nickname'		=> $first_name, // set nick name to be the same as first name
					'display_name'	=> $first_name, // set display name to be the same as first name
				)
			);

			// Set role
			$user = new WP_User( $user_id );
			$user->set_role( 'subscriber' );

			// User details
			$user_details = get_user_by( 'email', $email_address );
			$username = $user_details->user_login;

			// Subject line
			$subject = 'Your login details';

			// Build message
			$message = edd_get_email_body_header();
			$message .= sumobi_eddmp_build_email( $first_name, $username, $password );
			$message .= edd_get_email_body_footer();

			// get from name and email from EDD options
			$from_name = isset( $edd_options['from_name'] ) ? $edd_options['from_name'] : get_bloginfo( 'name' );
			$from_email = isset( $edd_options['from_email'] ) ? $edd_options['from_email'] : get_option( 'admin_email' );

			// headers
			$headers = "From: " . stripslashes_deep( html_entity_decode( $from_name, ENT_COMPAT, 'UTF-8' ) ) . " <$from_email>\r\n";
			$headers .= "Reply-To: ". $from_email . "\r\n";
			$headers .= "Content-Type: text/html; charset=utf-8\r\n";
			
			// send email
			wp_mail( $email_address, $subject, $message, $headers );

		}
		
	}
}
add_action( 'edd_create_payment', 'sumobi_eddmp_create_payment', 1 );



/**
 * Email Template Body
 */
function sumobi_eddmp_build_email( $first_name, $username, $password ) {

	// Email body
	$default_email_body = '';

	if ( $first_name ) {
		$default_email_body .= "Dear" . ' ' . $first_name . ",\n\n";
	}
	else {
		$default_email_body .= "Hi" . ",\n\n";
	}
	
	$default_email_body .= "Below are your login details:" . "\n\n";
	$default_email_body .= "Your Username:" . ' ' . $username . "\n\n";
	$default_email_body .= "Your Password:" . ' ' . $password . "\n\n";
	$default_email_body .= get_bloginfo( 'name' ) . "\n\n";
	$default_email_body .= site_url();

	return apply_filters( 'edd_purchase_receipt', $default_email_body, null, null );
}