Chaining of config

[stanleynguyen]

Instead of having all config inside constructor's params

xendit-go/client/api.go

Line 47 in 4e59149

func New(secretKey string, xenditURL string, apiRequester *xendit.APIRequester) *API {

We can do chaining like below

// because secretKey is required param
func New(secretKey string) {}

func (c *Client) WithAPIRequester(r *APIRequester) *Client {}

func (c *Client) WithXenditURL(u string) *Client {}