...

It is necessary to create a new customer account for connection between Magento 2 and WorldPay.

First of all, go to https://worldpay-payment-and-subcriptionsonline.worldpay.com/ and register an WorldPay accounts (click on "Create an account"). If you already have an account, you can skip this step. 

...

When your account is activated, you can login on the page https://worldpay-payment-and-subcriptionsonline.worldpay.com/

.

. 

...

Configuration

General Configuaration

...

        You will get API Keys by signing in website: https://worldpay-payment-and-subcriptionsonline.worldpay.com/ then click on Settings menu and choose API Keys

...