There are multiple ways to contact the community. Depending by what information you are looking for, you might want to contact a workgroup, single members of the community, or the Core Team.
Monero has one of the largest communities of any open-source project. Monero researches, audits, and implements critical security and privacy technologies, which are user by millions worldwide.
The Monero community has substantial involvement at Defcon, Grayhat and the CCC (Chaos Computer Club). The Monero Konferenco, an academic conference, is hosted annually.
Accepting a payment with the GUI is very easy. Doesn't matter if you are a merchant or an user, you will have two pages available: Receive and Merchants.
