[ENGA3-808] : Allow hosts config

[ajzkk]

Objective

Allow hosts config and added missing source retrieve function

#ENGA3-808

Description

• Allow hosts config to switch staging url.

  
  import Omise from "omise";

const config = { host: "api.xxxxxxx.co", vaultHost : "vault.xxxxxxx.co", publicKey: "pkey*****", secretKey: "skey*****", omiseVersion: "2019-05-29", };

const omise = Omise(config)

- Check response is valid json and reject promise if not valid.
- Add types to support hosts
- Added  missing source retrieve function `omise.sources.retrieve('src_xxxxxx')`

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
10 Code Smells

No Coverage information
0.0% Duplication