A simple metamask notification code example.

mock_notification.js

var state = {
          imageifyIdenticons: false,
          txData: {
            "id":1467868023090690,"txParams":{"data":"0xa9059cbb0000000000000000000000008deb4d106090c3eb8f1950f727e87c4f884fb06f0000000000000000000000000000000000000000000000000000000000000064","from":"0xfdea65c8e26263f6d9a1b5de9555d2931a33b825","value":"0x16345785d8a0000","to":"0xbeb0ed3034c4155f3d16a64a5c5e7c8d4ea9e9c9","origin":"MetaMask","metamaskId":1467868023090690,"metamaskNetworkId":"2"},"time":1467868023090,"status":"unconfirmed","containsDelegateCall":false
          },
          accounts: {
            '0xfdea65c8e26263f6d9a1b5de9555d2931a33b825': {
              balance: "0x15e578bd8e9c8000",
            }
          },
          identities: {
           '0xfdea65c8e26263f6d9a1b5de9555d2931a33b825': {
              name: "My Main Wallet",
              balance: "0x15e578bd8e9c8000",
            }
          },
        }
METAMASK_NOTIFIER.createTxNotification(state)