I was thinking about this last night............. I attend about 4 or 5 games a season these days and when i do, i purchase my ticket online and select my preferred seat...
Then the ticket is sent to me through the post and i have a hard copy ticket which clearly shows where i am sitting...
When i use my new card how will i demonstrate on the day what seat i have selected ??
As long as you know your seat number from the on line transaction - and you sit there , there’s no issue- I can’t see you being challenged either by a steward or an interloper.