I tried using REST proxy:
type=lnd-rest;server=http://umbrel.local:8080/;macaroon=“MACAROON_HEX”;allowinsecure=true;
but i get an error:
Error while connecting to the API: Error while copying content to a stream. (Unable to read data from the transport connection: Connection reset by peer.)
Also tried with the local ip or onion address.
It BTCPAY docs it also says it works with RTL from Server Settings / Services, and RTL should be exposed there, but for me it is not.
Just to check first, was there any issue when selecting ‘internal node’ for the lightning node side of the BTCPay server configuration? Usually integrating lightning requires no set-up at all with this option
You should be able to do this under ‘Change Connection’