Invalid authentication credentials - basic-auth

Questions
1

I am new for Kong API and doing POC for basic-auth plugin but getting exception, please help to resolve. The basic auth plugin working with the kong ingress controller. This is my current setup:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: demo.yolo42.com
  annotations:
    kubernetes.io/ingress.class: kong
    konghq.com/plugins: basic-auth-example
spec:
  rules:
  - host: demo.yolo42.com
  - http:
      paths:
      - path: /foo
        backend:
          serviceName: echo
          servicePort: 80
---
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: basic-auth-example
config:
  hide_credentials: true
plugin: basic-auth
---
apiVersion: configuration.konghq.com/v1
kind: KongConsumer
metadata:
  name: test
  annotations:
    kubernetes.io/ingress.class: kong
username: "xyz"
credentials:
 - user-key
---
apiVersion: v1
kind: Secret
metadata:
  name: user-key
stringData:
  kongCredType: basic-auth
  password: "XXXX"