Hello,
01. Login to WooCommerce admin panel and go to “WooCommerce” → “Settings” tab. Switch to the “Payments” tab and select the payment provider you use .Make sure the required information is entered correctly.
02. Go to your hosting provider’s control panel or management interface. Check the SSL certificate settings and make sure a valid SSL certificate is installed.
03. Go to the WooCommerce admin panel and switch to “WooCommerce” > “Settings” tab. Change the payment provider in the “Payments” tab. For example, if you use PayPal, choose Stripe or another payment provider and check how it works.
Best Regards.