There are don't have any option to cash out from Payza to bKash directly.
Good news, Recently we (Paytiz) launched a platform. You can now cashout From Payza to bKash easily.
1. Go to Paytiz.com
2. Register and Verify your account.
3. Click to the exchange button and choice Send option "PAYZA USD" and into Receive Option "bKash BDT"
4. Then fillup required option.
5. Send Payment.
6. Wait few minutes or Hours to receive Payment into your bKash account.
Thanks in Advance.