Magento 2 Payment Restrictions Extension is certainly a safe and secure module for restricting payment methods. Built by certified Magento developers, the extension employs best coding practices and has been thoroughly tested to ensure it leaves your store with no vulnerabilities whatsoever.

Read this guide on How to Restrict Some Payment Methods in Magento 2 with MageDelight's Payment Restrictions Extension for Magento 2.

Here are the few useful resource to help.
1. How to Disable a Payment Method Programmatically in Magento 2?.
2. How to Disable Payment Method for Certain Customer Groups in Magento 2?.