How are you handling your kyc/aml requirements?
What do you mean? After the purchase the owner will be changed in the corresponding documentation. This all has to be done in front of a law official.
I don't know where you ar ebased, but usually you ahve to make sure
a) funds are not the proceeds of crime (harder with crypto and cash)
b) Your not a money transmitter
c) The other person is not a potentially exposed person
d) your not enabling money laundering in any way
e) ID to confirm they are whom they say they are, and your keeping records in compliance with KYC/AML directives