"Apple (alt) Marriott code APC is a secondary Apple corporate code, alongside the primary APL code. Apple's primary code APL is documented as triggering heightened enforcement within 5 miles of Apple HQ in Cupertino — "hotels that handle hundreds of Apple travelers a week are intimately familiar with Apple corporate ID badges." The alt code APC may be routed through different GDS channels but Apple's code presence at Silicon Valley Marriotts is well-established. No APC-specific denial documented; enforcement pattern mirrors the primary APL code."

"I have been asked to show some proof couple of times. I normally show my corp id but credit card with employers name on it has worked, too. As would probably just showing my laptop with employer e-mail account or whatever. My impression has been they are happy with just about anything that proves I'm working for the company whose rate I use and why wouldn't they."

"I don't do mobile check-in if I'm wanting to upgrade. I check the app before I go in to see if any suites are available to book during the duration of my stay. If there is I just say "Would it be possible to get upgraded to an available suite with my platinum benefit?". Of course this is typically at the hotel that I stay in about once a month for 3 day at a time for work. The front desk pretty much knows me and know that I am fairly low maintenance."