Authentication
Set your headers:
Authorization: {your_credentials} Accept: application/vnd.worldpay.payment-queries-v1.hal+json
Replace {your_credentials}
with your base64-encoded Basic Auth username and password.
DNS Whitelisting
Whitelist the following URLs:
https://try.access.worldpay.com/
https://access.worldpay.com/
Please ensure you use DNS whitelisting, not explicit IP whitelisting.