Update 'README.md'

Payment processing information and cron for z_shieldcoinbase

README.md

@@ -134,6 +134,14 @@ The pool fee is taken in the payment processor using this mode, and might not be
 ### Payment Processing
 Please note that the default configs generated are for solo mining. If you wish to create a public pool please modify the configs like in this [example config](https://github.com/z-classic/z-nomp/blob/master/pool_configs/komodo_example.json)
 
+Because Hush enforces z-z transactions, in order for payment processing to work, you must shield coinbase first. The simplest way to do this is to setup a cron like the following, which will run `z_shieldcoinbase` every 10 minutes. 
+
+```
+*/10 * * * * cd /home/hush3/src && ./hush-cli z_shieldcoinbase "tAddress-used-in-pool-config" "zAddress-used-in-pool-config"
+```
+
+You can adjust this based on your  pool's paymentInterval. Alternatively, one could modify `./libs/paymentProcess.js` to use `z_shieldcoinbase` before attempting to perform the `z_sendmany` within the `sendTToZ` function. This is older code from Komodo ecosystem where z-z transactions were not enforced. 
+
 There is now a config option you can add to your pool_configs/coin.json to toggle making an attempt at a payment upon pool startup.
 
 ```