How do I check if the client has made payment for the Will?

There is no need to manually confirm (e.g. ask client to show you proof of payment) if payment has been made by the client. Once the client has made payment, both you and the client will receive an automated email titled "Will draft sent .... - getArrange.com" which includes the receipt.

If you are at the payment page, to check the payment you can refresh the payment page or click on "Check Payment" which will automatically redirect you to the summary page to generate the Will once payment is complete.

You can also view any past payment made in the invoice history page.