I have added a new option
Disable Security Token Check to the testing version of the plugin. You can get it here https://s-plugins.com/testing-version/
Enable it (Stripe Payments -> Settings, Advanced Settings tab, Experemintal Settings
section) and it should make
Invalid Security Token issue go away. Since you’re using reCaptcha on your payment form, it’s okay to disable Security Token as reCaptcha acts as security token in this case.