Like I said, the Apple part of the job (payment) works just fine.
But then no licence is provided. I've :
Downloaded/installed the 3 apps (without launching any of the 3 before the installation was completed) from the App Store
Launched one app (Affinity Photo 2)
Chosen the purchasing option, followed the steps, received a payment confimation from Apple
But then… Nothing. Stuck on the account panel with two choices: trial (30days) or connect with Affinity ID.
Of course, I can choose the trial version. But I'm not interested in a trial version. I want something I can use without any restrictions and I'm willing to pay for that. But it seems it's not possible. From what I've read here, it seems to be the same while purchasing directly from the Affinity website. So I'm not sure I want to give my bank account a second chance to be charged for nothing. At least, at Apple I can ask for a refund.
Of course it's only my personal experience. Some other people says Paypal process is working fine. I don't have (and don't want) a Paypal account.