I saw seven away games last year but only three with tickets bought through the club. Others were POTG, given a ticket at Brentford, guest of home team fan etc.
If you're canny and tenacious, you can get tickets to a lot of away games. As people have said, the marquee games will be harder, but...
Yes Pay seems to have been an issue.
Ticket in the basket, all sorted. Complete the credit card form, takes me through to authentication, then says transaction error and asks me to restart. Ticket still in the basket, so go round again - and same issue. In the end, called the ticket office who...