Hello,
Thank you so much for purchasing our theme and contacting us.
To use PayPal you may probably need to need to establish SSL connection for your website. You can find more information in WooCommerce documentation https://docs.woocommerce.com/document/paypal-standard/
As for Stripe payment so it seems that there is some issue in our theme. Are you able to send us your temporary FTP access so we could check everything?
Regards