- eTickets (QR codes provided as a PDF and Apple/Google wallet addable ticket) are accepted by Merseyrail and available for purchase in flows that use Merseyrail services
- Mobile tickets (the older version of electronic tickets which needed to be activated in an app first) aren't accepted or available and are being phased out as eTickets are meant to be entirely universal.
- ToD (Ticket [Printed] On Departure) isn't available at Merseyrail stations or machines
eTickets had a storied history of being available, then not, then available again over the past few years. But they're okay now, Merseyrail just don't have a way to check them properly other than via the Mk.1 Eyeball.
Really all they need to do is enable ToD to be printed at booking offices and update their signage to remind people to collect their tickets before travelling. Their booking office systems support it, it just seems they never wanted to do it for some reason.