create a page for a user on login

page_create.php

<?php

/**
 * Creates a page for a user if it doesn't exist when they login
 * @param  string $user_login The login the user used
 * @param  WP_User $user       WP_User object
 */
function create_my_page( $user_login, $user ) {

	$has_shop    = get_user_meta( $user->ID, 'has_shop', true );
	$page_exists = get_page_by_title( $user->tds_shop_name, OBJECT, 'business' );
	if ( $page_exists || $has_shop ) {
		// The page already exists by that title, so we stop here.
		return;
	}

	$post_args = array(
		'post_title'   => $user->tds_shop_name,
		'post_author'  => $user->ID,
		'post_type'    => 'business',
		'post_content' => '',
		'post_status'  => 'private',
	);

	$inserted_post = wp_insert_post( $post_args, true );
	if ( ! is_wp_error( $inserted_post ) ) {
		// Update the user meta with the shop page ID
		update_user_meta( $user->ID, 'has_shop', $inserted_post );
	}

}
add_action( 'wp_login', 'create_my_page', 10, 2 );