Haven’t received IHS worldpay receipt

I paid for ihs and tier 4 visa fee
Received one email for confirmation of ihs payment , another of ihs number and third email confirmation of visa fee and appointment details at local vfs office.
The email states that I would also receive a receipt from worldpay for ihs that I need to attach with the application. But I haven’t received anything of that sort.

Transaction confirmation email from HO is itself a proof of payment. You will receive IHS ref only when your payment is through.

It will be said in the email " On completion of your IHS application you will also be emailed a copy of your IHS reference number, which you will need for your immigration application."

Worldpay receipt not required.