Feat: refactor routes.js express entrypoint config

Feat: express config script refactor

Feat: add state and settingsCache files

lib/routes/verifyTxRoutes.js

@@ -0,0 +1,15 @@
+const express = require('express')
+const router = express.Router()
+
+const plugins = require('../plugins')
+
+function verifyTx (req, res, next) {
+  const pi = plugins(req.settings, req.deviceId)
+  pi.verifyTransaction(req.body)
+    .then(idResult => res.status(200).json(idResult))
+    .catch(next)
+}
+
+router.post('/', verifyTx)
+
+module.exports = router