In Medilink 2019 R1 we added the option to print PayID details to the bottom of invoices, to take payment that way.

Simply go to the Edit Provider Details screen, click Bank/EFT, and fill in their PayID:

The option to enable/disable this is in General Options:

Then when you print unpaid invoices you will see the PayID at the bottom of the page next to the cheques and EFT.

New style MediLinkIt Billing printout:

Old style printout:

Crystal Report style printout:

Note that custom Crystal Report style invoices will not have this field.