The ProZ wallet cannot be used to receive money from clients.
This is how ProZ explains the feature:
Your ProZ.com wallet is used to track payments you have made for items and services purchased through the site. You may also deposit amounts to your wallet, to be used for such things as Blue Board access, job quoting (full members already have this access), text ads, etc. Your wallet is not intended as a payment method or for use in transferring funds from one account to another.
18.2 - How can I accept payments through my ProZ.com Profile page?
Unfortunately, the ProZ.com Payments feature (top right corner in the Profile pages) is no longer available.
Hope this helps.