Authorized.net error with Magento2.3.1

Question

I have done the configuration https://prnt.sc/noflvl

Then try to place an order and found below error messages: https://prnt.sc/nofznb

https://prnt.sc/nofhpp

What is the issue, I created a new developer account on authorized.net but no luck.

I think the issue is due to the "https", As I am testing it on server which is not having ssl.

How can I test Sandbox here?