WIP Persist zaps, create and send zap receipts

app/models/zap.rb

@@ -1,3 +1,17 @@
 class Zap < ApplicationRecord
   belongs_to :user
+
+  def request_event
+    nostr_event_from_hash(request)
+  end
+
+  def receipt_event
+    nostr_event_from_hash(receipt)
+  end
+
+  private
+
+    def nostr_event_from_hash(hash)
+      Nostr::Event.new(**hash.symbolize_keys)
+    end
 end