He's referring to the submission vouchers one gets with a paid PCGS membership. I don't have the answer to this question, but I'm going to take the liberty of moving the thread to the place where it'll get a more dedicated audience.
I don't have experience using the voucher for secure plus but I did read on another forum that someone else was able to use the 8 coin voucher for secure plus. I would still contact PCGS just to make sure.
I am pretty sure you can pay the difference and get it with the vouchers. I have used mine with the variety tier and only paid the variety price that they add to the coins so I am almost positive it should be the same
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