Hmm, I've been mining with default settings during the night and I got some wtc when I synced my worldcoin client. Then I changed my settings (added +0.0000xxxx type of thing) and I have been mining for 2-3 hours since then with a few thousand accepted shares but nothing appears in my client nor on the pool's website.
To get paid, you have to send a share which is more difficult than (Share difficulty) * 65536 (and this share should be accepted).
You can see "Share difficulty" value on
http://212.48.67.50:8336/static/ , now it is 0.395 (it depends on the p2pool's hashrate and constantly recalculated).
So the share should be more difficult than 0.395 * 65536 = 25887 (like "Diff
25.9K/..." in cgminer; the first part of such "difficulty" is always more than the second one, which is managed by "+0.0000xxxx").
Note: If the first part of your share difficulty is more than the network difficulty, you will find a block.