Before you get started, make sure you've checked out the full guide on how to create a WooCommerce payment gateway (it's important to read that one before reading this post). However, if you're using the latest version of WooCommerce (I think it's from 8.3 onwards), you may find that your custom payment method doesn't appear in the checkout block. For example, if you try to disable all payment methods in the store except your customized one, you may encounter the following error message: while using...