func ExampleClient_Sandbox() {
	api := NewClient("world", "", "")
	api.Sandbox()  
}
This will enable test mode and connect you to the sandbox server.
package openfoodfacts
import (
	"fmt"
	"time"
)
func ExampleClient_Product() {
	api := NewClient("world", "", "")
	product, err := api.Product("5201051001076")
	if err != nil {
		fmt.Printf("%+v\n", product)
	}
}