OK, so this is the first time we've bought tix thru a reseller. We usually order AP's thru DVC. Our last AP's were expiring 7/25 and we have a trip planned in Sept. so in order to be able to make FP+ res. at 60 days this time tho I ordered (3) 7-day hoppers thru parksavers.com rather than renewing our AP's - thinking that we would just upgrade to the DVC Gold pass in Sept. I figured this way we could "save" the 2 months from July 25 to Sept 17th and extend our next exp. date from July exp. to Sept. exp. which would be helpful for NEXT summer to not be so restricted. (It was only going to be $8 more to do it this way rather than just renewing @ the DVC rate.)
But so
ANYWAY, so here's my question and where I'm confused (it doesn't take much to confuse me).

Parksavers sent us codes to use for the hoppers which I entered into
MDE so I could book our FP's. But now I don't have any physical tix. It's all online? How exactly do I upgrade to the AP's? What do I bring with me to Guest Relations or whatever in order do that? Do I print out the email from parksavers with the codes and bring that or do they just read our magic bands at the gate and use the bands for the upgrade? Just not used to not having that physical AP card so I don't quite grasp HOW the upgrade happens.
TIA for helping me understand...