added BTCPay connect info

README.md

@@ -243,6 +243,34 @@ There is now the option to connect and control your LND node with the mobile app
 
 ![shango1](pictures/shango1.png)
 
+#### RaspiBlitz as Backend for BTCPayServer (experimental)
+
+BTCPay Server is a solution to be your own payment processor to accept Lightning Payments for your online store: https://github.com/btcpayserver/btcpayserver here is how to connect the RaspiBlitz as your payment node:
+
+##### BTCPayserver config
+
+Make sure you have these setting in: `<installdir>/NBXplorer/.nbxplorer/Main/settings.config`
+
+`btc.rpc.url=http://[YOUR RASPIBLITZ IP/DOMAIN]:8332/
+btc.rpc.user=raspibolt
+btc.rpc.password=[PASSWORD B]`
+
+Command to start NBExplorer:
+`./run.sh --datadir /opt/NBXplorer/.nbxplorer --btcnodeendpoint <raspiblitz-ip> &`
+
+Start btcpayserver as normal, it will connect to raspiblitz thru NBXplorer
+
+##### Raspiblitz config
+
+Make sure you have this in: `/mnt/hdd/bitcoin/bitcoin.conf`
+
+`rpcallowip=[BTCPAYSERVER IP]/255.255.255.0
+whitelist=[BTCPAYSERVER IP]
+rpcuser=raspibolt
+rpcpassword=[PASSWORD B]`
+
+Thanks to @RobEdb (ask on twitter for more details) running his demo store with RaspiBlitz: https://store.edberg.eu - buy a picture of [him and Andreas](https://store.edberg.eu/produkt/jag-andreas/) :)
+
 ## Educational Tutorials
 
 *Once the Setup Process is done, the learning and building should begin ... more detailed educational content should be added in this section in the future.*