Yandex.Checkout and Bitrix, how to check the work on a test site (you can’t connect to a live site yet)?

Question

Yandex

Good afternoon! The problem is the following, you need to connect Yandex.Checkout to the CMS site - Bitrix, but the site has a customized order form that does not work like a standard form. Therefore, before connecting to the production site, I would like to try to configure this module in a test environment.
Tech support said that you can only implement a checkout on a combat site, which in this situation can be fraught.
Are there any ways to still carry out checks in a test environment first (at least without payment, but in order to catch the transition to the Yandex.cash payment form itself), and then transfer it to a combat one?
Maybe someone had a similar experience?