Manually claim a payment – why and how?

Firstly, do I have to always manually claim a payment I receive from somebody? (The PayPal writes me I have to manually claim a particular payment, since I am an international customer.

Second: May I choose if a person I pay to will need to manually claim the payment and how?

Third: is it a *must* option for small paymens, say 20-30 USD?

Thanks!