How to create cgi on Modx revo to replenish the balance on the site in the QIWI payment system?

Question

MODX

Hello.
Question: How to properly implement the balance replenishment interface on the site using the Qiwi payment system?
Task: It is necessary to create 1 script for a certain url ( https://mysite.ru/script.php ). the script executes the logic based on the passed parameters. usually this script has 2 tasks - checking the user's status and replenishing the account.
Method 1: Put the script file in the root and play with .htaccess
Method 2: Create a page in the manager and call the logic snippet on it. and also edit .htaccess to redirect when accessing mysite.ru/scriptpage.php to https://mysite.ru/scriptpage.php
are there any other more elegant options?