You check the AP rates using the AP corporate discount code at the Marriott website or in the Bonvoy app. You can have multiple corporate codes so, if your company has an agreement with Marriott, be sure to enter that code too. If you have AAA and/or are over 62 check those applicable rates as well. The Marriott website/Bonvoy app will conveniently display the least expensive rates. One very annoying thing about swan/dolphin/swan reserve is that, unlike every other Marriott property I’ve stayed at in the world, they require prepayment for your entire stay, even on fully refundable rates. So, if you’re using a fully refundable corporate rate and booking months in advance, you may still have a couple thousand dollars tied up with them. I’d prefer that money to be in my hands, not theirs - especially with the pathetic housekeeping situation