feat: implement subscriber info retrieval

lib/sms.js

@@ -12,4 +12,15 @@ function sendMessage (settings, rec) {
     })
 }
 
-module.exports = {sendMessage}
+function getLookup (settings, number) {
+  return Promise.resolve()
+    .then(() => {
+      const pluginCode = argv.mockSms ? 'mock-sms' : 'twilio'
+      const plugin = ph.load(ph.SMS, pluginCode)
+      const account = settings.accounts[pluginCode]
+
+      return plugin.getLookup(account, number)
+    })
+}
+
+module.exports = { sendMessage, getLookup }