diff --git a/.env.sample b/.env.sample
index 9f5e894d..8a9f91f8 100644
--- a/.env.sample
+++ b/.env.sample
@@ -15,16 +15,27 @@ TWITTER_SECRET=<YOUR TWITTER SECRET>
 LOGIN_EMAIL_SERVER=smtp://<YOUR EMAIL>:<YOUR PASSWORD>@<YOUR SMTP DOMAIN>:587
 LOGIN_EMAIL_FROM=<YOUR FROM ALIAS>
 
-# lnurl-auth
-LNAUTH_URL=<YOUR PUBLIC TUNNEL TO LOCALHOST, e.g. NGROK>
+#####################################################################
+# OTHER / OPTIONAL                                                  #
+# configuration for push notifications, slack and imgproxy are here #
+#####################################################################
 
 # VAPID for Web Push
 VAPID_MAILTO=
 NEXT_PUBLIC_VAPID_PUBKEY=
 VAPID_PRIVKEY=
 
+# slack
+SLACK_BOT_TOKEN=
+SLACK_CHANNEL_ID=
+
+# imgproxy
+NEXT_PUBLIC_IMGPROXY_URL=
+IMGPROXY_KEY=
+IMGPROXY_SALT=
+
 #######################################################
-# LND / OPTIONAL                                      #
+# WALLET / OPTIONAL                                   #
 # if you want to work with payments you'll need these #
 #######################################################
 
@@ -33,6 +44,13 @@ LND_CERT=<YOUR LND HEX CERT>
 LND_MACAROON=<YOUR LND HEX MACAROON>
 LND_SOCKET=<YOUR LND GRPC HOST>:<YOUR LND GRPC PORT>
 
+# lnurl
+LNAUTH_URL=<PUBLIC URL TO /api/lnauth>
+LNWITH_URL=<PUBLIC URL TO /api/lnwith>
+
+# nostr (NIP-57 zap receipts)
+NOSTR_PRIVATE_KEY=<YOUR NOSTR PRIVATE KEY IN HEX>
+
 ###############
 # LEAVE AS IS #
 ###############
@@ -46,10 +64,7 @@ NEXTAUTH_SECRET=3_0W_PhDRZVanbeJsZZGIEljexkKoGbL6qGIqSwTjjI
 JWT_SIGNING_PRIVATE_KEY={"kty":"oct","kid":"FvD__hmeKoKHu2fKjUrWbRKfhjimIM4IKshyrJG4KSM","alg":"HS512","k":"3_0W_PhDRZVanbeJsZZGIEljexkKoGbL6qGIqSwTjjI"}
 INVOICE_HMAC_KEY=a4c1d9c81edb87b79d28809876a18cf72293eadb39f92f3f4f2f1cfbdf907c91
 
-# imgproxy
-NEXT_PUBLIC_IMGPROXY_URL=
-IMGPROXY_KEY=
-IMGPROXY_SALT=
+# imgproxy options
 IMGPROXY_ENABLE_WEBP_DETECTION=1
 IMGPROXY_MAX_ANIMATION_FRAMES=100
 IMGPROXY_MAX_SRC_RESOLUTION=200