Use lndhub.go v2 endpoint for invoice creation

app/controllers/lnurlpay_controller.rb

@@ -71,11 +71,7 @@ class LnurlpayController < ApplicationController
     end
 
     def metadata(address)
-      "[[\"text/identifier\", \"#{address}\"], [\"text/plain\", \"Send sats, receive thanks.\"]]"
-    end
-
-    def zap_metadata(event)
-      "[[\"application/json\", #{event.to_json}]]"
+      "[[\"text/identifier\",\"#{address}\"],[\"text/plain\",\"Sats for #{address}\"]]"
     end
 
     def valid_amount?(amount_in_sats)
@@ -92,14 +88,14 @@ class LnurlpayController < ApplicationController
         return
       end
 
-      memo = "To #{address}"
-      memo = "#{memo}: \"#{comment}\"" if comment.present?
+      desc = "To #{address}"
+      desc = "#{desc}: \"#{comment}\"" if comment.present?
 
-      payment_request = LndhubManager::CreateUserInvoice.call(
+      invoice = LndhubManager::CreateUserInvoice.call(
         user: @user, payload: {
           amount: amount, # sats
-          memo: memo,
-          description_hash: Digest::SHA2.hexdigest(metadata(address)),
+          description: desc,
+          description_hash: Digest::SHA256.hexdigest(metadata(address)),
         }
       )
 
@@ -110,7 +106,7 @@ class LnurlpayController < ApplicationController
           message: "Sats received. Thank you!"
         },
         routes: [],
-        pr: payment_request
+        pr: invoice["payment_request"]
       }
     end
 
@@ -135,15 +131,14 @@ class LnurlpayController < ApplicationController
         return
       end
 
-      payment_request = LndhubManager::CreateUserInvoice.call(
+      invoice = LndhubManager::CreateUserInvoice.call(
         user: @user, payload: {
           amount: amount, # sats
-          # TODO should be npub instead of address?
-          memo: "Zapped #{@user.address} on Nostr", # TODO include event ID if given
-          description_hash: Digest::SHA2.hexdigest(zap_metadata(event)),
+          description: event.to_json,
+          description_hash: Digest::SHA256.hexdigest(event.to_json),
         }
       )
 
-      render json: { status: "OK", pr: payment_request }
+      render json: { status: "OK", pr: invoice["payment_request"] }
     end
 end