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1. Go to Accounting - Payment Gateway Config and select "RBS WorldPay Payment Gateway" from the list
2. Please fill all those fields to made working correctly to work with RBS WorldPay:
   
   Transaction Redirect URL : Test/Production Transaction Redirect Url
   Certificate Alias : Certificate Alias in the Keystore.
   Authorize Dot Net API version : currently 3.1
   Delimited Data : if the authorize.net response should delimited
   Delimited Character : the delimiter to use in the response.
   Method (only CC supported) Worldpay Instance Id : Your Worldpay Instance Id.
   Authorization Mode : Full-Authorize / Pre-Authorize.
   Contact details not-editable : Will displace contact info on WorldPay in non-editable format
   Contact details to be hidden : Will hide the contact info completely
   Currency drop-down to be hidden : credit card processing.
   Email to Customer : if should send an email to the customer for each transaction
   Email to Merchant : if should send email to the merchant for each transaction
   Test Mode : Forces the URL property to the test URL and adds more logging info to the logs
   Relay Response : if should relay the reposnse to a different server
   Transaction Key : Authorizer.net transaction key.
   User Id : Your Authorize.net user id.
   Pwd : Your Authorize.net password.
   Trans Description : Your Transaction Description.
3. Once RBS WorldPay Payment Gateway has been configurated you have to go to Catalog - Stores - select your Store - Payments tab
   
4. Edit the Payment Method Type Credit Card and after selected a Service Type (Authorize, Capture, ...) you can choose the Custom Method related to the Service Type choosen and as Payment Gateway Config Id "RBS WorldPay Config".
   

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