I am only going off the way things where done in the previous satelites.
If you qualified in the online sats, you where given the money in your account. Then you followed the payment link that was setup. This means that the money never goes to a third party. I guess it would be the same for the live ones. The Grosvenor will have your money, and you are then relying on them transferring it to the APAT coffers. It makes sense for me for the casino to pay you out, and then you put it in your bank account and then pay onlinie direct to the APAT.
Sorry if I am wrong, which I could well be, and sorry for any confusion caused. I do know an announcement will be made soon.