Satoshi

I read in the article that agents will have to accept the payments but also will have the possibility to issue payments requests (to other agents).
Is there a mechanism in place that avoid using this feature (issuing requests) as some kind of spam or DDoS-sing the network?
What about payments to e.g. a donation campaign, the receiving party will have to manually accept every single donation?? I see the intention is to go from asynchronous to synchronous transactions but i’m talking about what i see presented asis not the hypothetic tobe.