correct lnurlp nostr pubkey stuff

pages/api/lnurlp/[username]/index.js

@@ -1,3 +1,4 @@
+import { getPublicKey } from 'nostr'
 import models from '../../../../api/models'
 import { lnurlPayMetadataString } from '../../../../lib/lnurl'
 
@@ -7,20 +8,13 @@ export default async ({ query: { username } }, res) => {
     return res.status(400).json({ status: 'ERROR', reason: `user @${username} does not exist` })
   }
 
-  let nostr = {}
-  if (user.nostrPubkey) {
-    nostr = {
-      nostrPubkey: user.nostrPubkey,
-      allowsNostr: true
-    }
-  }
-
   return res.status(200).json({
     callback: `${process.env.PUBLIC_URL}/api/lnurlp/${username}/pay`, // The URL from LN SERVICE which will accept the pay request parameters
     minSendable: 1000, // Min amount LN SERVICE is willing to receive, can not be less than 1 or more than `maxSendable`
     maxSendable: 1000000000,
     metadata: lnurlPayMetadataString(username), // Metadata json which must be presented as raw string here, this is required to pass signature verification at a later step
     tag: 'payRequest', // Type of LNURL
-    ...nostr
+    nostrPubkey: getPublicKey(process.env.NOSTR_PRIVATE_KEY),
+    allowsNostr: true
   })
 }