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Default Settlement Currency: to make your payment successful, you must choose currency suitable with both merchant and customer. It is called as the default settlement currency
Sitecodes: a sitecode is a value that can be passed in the order request to differentiate between different sites you have. A “site” could be different websites you have or it could be the same website but different internal suppliers of the service
Worldpay Online Payments: you can set Test Mode or Live Mode dependent on environment that you consider.
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