"This transaction cannot be accepted." with no error code

https://support.authorize.net/authkb/index?page=content&id=A852

Thanks for that. I did discover that the API key and login ID were incorrect. I fixed that and now I get a different error message:
“The merchant login ID or password is invalid or the account is inactive.”

I called Authorize.net and they verified that the account is active and that the API and Login are correct. They gave me this doc to look at:
https://support.authorize.net/authkb/index?page=content&id=A415&actp=search&viewlocale=en_US&searchid=1447273053204

This doc says that there are only 3 possible problems that could cause this error. The first two are ruled out; API/Transaction key are correct and the account is active. The third has to do with the Authorize.net URL that is being posted to. I was encouraged to contact you to be sure that the plugin is posting to https://secure.authorize.net/gateway/transact.DLL

If it is not posting to this URL, it will not work. Can you please tell me how to check this?

Thanks,
Jason

Hi Jason ,

if you remember we communicated on mail regarding this plugin on another support thread however I am using Authorize.net library that is posting to live url https://secure.authorize.net/gateway/transact.dll

Plus need to make sure you are using test account in test mode and live account in live mode

test account are always here https://sandbox.authorize.net/

and NO live account in test mode willl work so you will have to test with live account in live mode

There is a checkbox in plugins setting to put plugin in live or sandbox mode as well

thanks
Nazrul

Thank you again for your excellent help. The problem was with the API and transaction key. This is resolved.