PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.
PaypalCaptcha
The PayPal Captcha module provides a possibility to enable Captcha validation on Payflow Pro payment form.