Stripe seems to be the perfect one, wepay looks like a great competitor to PayPal, in fact all the great payment processing companies are US only, I'm desperate finding a good solution available in europe, working in France as far as I'm concerned.
Finaly, I'll go with PayPal, just because it's the only one working worlwide without a merchant account.
That's a nice feature, but still looks half-baked for me.
It's now ios6 and you still need to jailbreak your iphone to blacklist people harassing you with phone calls or imessage.
What I do need is a blacklist feature which send to /dev/null people I don't want to talk to or receive imessage or sms from, and the DND feature looks more like a whitelist only available to phone calls.
Maybe in ios 7 ? It seems like a basic feature and I wonder which Apple Developper Program rule prevent to develop such an app available in the app store.