Restore Authorize.net Payment Method

I accidentally deleted Authorize.net from my Payment Methods and would like to restore it.  What do I need to do to fix this?  I searched the forums but couldn't find an answer.  I'm running 1.40.

Thank you!

You could try the add payment method back in

Name:    Authorize.NET
Visible name:   Credit Card
Description:    
Configuration template path:    Payment\AuthorizeNET\ConfigurePaymentMethod.ascx
User template path:   ~\Templates\Payment\AuthorizeNET\PaymentModule.ascx
Class name: NopSolutions.NopCommerce.Payment.Methods.AuthorizeNET.AuthorizeNetPaymentProcessor, Nop.Payment.AuthorizeNet    
System keyword:    
Active:    
Display order:   2  

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If you're using this gateway remember that you should set your store primary currency to US Dollar.  
Use Sandbox:    "Check this one"
Transaction mode:  Authorize - select this one
Authorize and Capture  
Transaction key:    what ever it is(123456)
Login ID: what ever it is(123456)

Thanks.  I'll let you know  how it goes.

It worked.  Thanks!!