A Payment Request is just a request for the tenant to pay, it is not a VAT invoice, so there is no VAT liability.
Payment is still due on the due date, so from an arrears point of view there is no difference between this and an invoice, there is only VAT liability once a VAT invoice is raised and this is only done upon receipt of payment.
Currently there is only one Payment Request template and at this stage it is unable to be modified.
Prerequisites for Payment Requests
Must be a UK customer (excludes Jersey)
Must be a Client Account user
Property usage type must be commercial or mixed
Property must be VAT Elected
Payment Requests can be turned on for a Property on the Property Details page, and will only appear if VAT Elected is set to VAT.